Wine in Lutris (Flatpak) works, except in games

I installed the Lutris launcher from beta Flathub. It launches GOG Galaxy through Wine and it seems to work as usual, except I won’t launch any game.

This is terminal output from the moment I tried to launch Witcher 3 (game that did run on previous distro) till after it already crashed:

$ flatpak run net.lutris.Lutris
2019-09-19 22:53:15.721 [Information][ (0)] [TID 364][client_renderer]: Log started. Application version: 1.2.58.220 (2019-09-12 13:35).
2019-09-19 22:53:15.722 [Information][ (0)] [TID 364][client_renderer]: Operating system: Windows 7 6.1 (Build 7601: Service Pack 1) (IA32)
2019-09-19 22:53:15.723 [Information][ (0)] [TID 364][client_renderer]: Platform identification: win7 64bit
2019-09-19 22:53:15.724 [Information][ (0)] [TID 364][client_renderer]: Initial logs enabled for Renderer process, will switch to own log file after initialization.
2019-09-19 22:53:15.725 [Information][ (0)] [TID 364][client_renderer]: Identified process with pid 363 as Gpu, switching to own log file.
2019-09-19 22:53:15.727 [Information][ (0)] [TID 364][client_renderer]: Switching logger from 'C:\ProgramData\GOG.com\Galaxy\logs\ClientHelper.log' to log to 'C:\ProgramData\GOG.com\Galaxy\logs\ClientHelper-Gpu.log'.
Logger Exception: Cannot open file(C:\ProgramData\GOG.com\Galaxy\logs\ClientHelper-Gpu.log), code 0
Logger Exception: Cannot open file(C:\ProgramData\GOG.com\Galaxy\logs\ClientHelper-Gpu.log), code 0
Logger Exception: Cannot open file(C:\ProgramData\GOG.com\Galaxy\logs\ClientHelper-Gpu.log), code 0
Logger Exception: Cannot open file(C:\ProgramData\GOG.com\Galaxy\logs\ClientHelper-Gpu.log), code 0
Logger Exception: Cannot open file(C:\ProgramData\GOG.com\Galaxy\logs\ClientHelper-Gpu.log), code 0
2019-09-19 22:53:17.873 [Information][ (0)] [TID 183][client_renderer]: Received message: 'sendToJS', from 'browser' process, to browser with ID: 1 with main URL 'file:///C:/Program%20Files%20(x86)/GOG%20Galaxy/web/main.html'
2019-09-19 22:53:18.078 [Information][ (0)] [TID 9][galaxy_client]: Scheduling single product check task for product showing game view requested for '1207664643'. IgnoreCheckedRecently?: false.
2019-09-19 22:53:18.079 [Information][SubSystem installer thread (4)] [TID 62][galaxy_client]: Starting ClientTask: SingleProductCheckTask
2019-09-19 22:53:18.079 [Information][ (0)] [TID 183][client_renderer]: Received message: 'sendToJS', from 'browser' process, to browser with ID: 1 with main URL 'file:///C:/Program%20Files%20(x86)/GOG%20Galaxy/web/main.html'
2019-09-19 22:53:18.273 [Information][SubSystem shortTasks thread (2)] [TID 60][galaxy_client]: Starting ClientTask: FetchGameViewInformationTask
2019-09-19 22:53:20.192 [Information][ (0)] [TID 9][galaxy_client]: Full ProductDetails fetched for game '1207664643'. Sending to frontend (force: false).
2019-09-19 22:53:20.192 [Information][ (0)] [TID 183][client_renderer]: Received message: 'sendToJS', from 'browser' process, to browser with ID: 1 with main URL 'file:///C:/Program%20Files%20(x86)/GOG%20Galaxy/web/main.html'
2019-09-19 22:53:20.194 [Information][ (0)] [TID 351][galaxy_client]: Directory paths: 'C:\ProgramData\GOG.com\Galaxy\webcache\1207664643' already exists.
2019-09-19 22:53:20.620 [Information][ (0)] [TID 350][galaxy_client]: The scheduling for the periodic product check was skipped as the installer is busy.
2019-09-19 22:53:20.621 [Information][ (0)] [TID 350][galaxy_client]: Skipped running FetchAllProductDetailsTask because it ran 605 minutes ago.
2019-09-19 22:53:20.778 [Information][ (0)] [TID 9][galaxy_client]: Scheduling single product check task for product showing game view requested for '1207664643'. IgnoreCheckedRecently?: false.
2019-09-19 22:53:20.779 [Information][ (0)] [TID 183][client_renderer]: Received message: 'sendToJS', from 'browser' process, to browser with ID: 1 with main URL 'file:///C:/Program%20Files%20(x86)/GOG%20Galaxy/web/main.html'
2019-09-19 22:53:21.593 [Information][ (0)] [TID 183][client_renderer]: Received message: 'sendToJS', from 'browser' process, to browser with ID: 1 with main URL 'file:///C:/Program%20Files%20(x86)/GOG%20Galaxy/web/main.html'
2019-09-19 22:53:25.357 [Information][ (0)] [TID 9][galaxy_client]: Searching for old overlay in 'C:/Program Files (x86)/GOG Galaxy/Games/The Witcher 3 Wild Hunt'.
2019-09-19 22:53:25.594 [Information][ (0)] [TID 9][galaxy_client]: Old overlay not found.
2019-09-19 22:53:25.598 [Information][ (0)] [TID 9][galaxy_client]: Sending visibility 'hide' change to desktop notification process.
2019-09-19 22:53:25.599 [Information][ (0)] [TID 188][Process]: Visibility changed (hide) message received from client.
2019-09-19 22:53:25.600 [Information][ (0)] [TID 9][galaxy_client]: Launching the game: The Witcher 3: Wild Hunt (1207664643).
2019-09-19 22:53:25.601 [Information][ (0)] [TID 9][galaxy_client]: The game '1207664643' is pending launch.
2019-09-19 22:53:25.602 [Information][ (0)] [TID 376][galaxy_client]: Starting cloud sync before game '1207664643' starts.
2019-09-19 22:53:25.603 [Information][ (0)] [TID 376][galaxy_client]: Cloud saves for the user is allowed as it is enabled for all.
2019-09-19 22:53:25.634 [Information][ (0)] [TID 183][client_renderer]: Received message: 'sendToJS', from 'browser' process, to browser with ID: 1 with main URL 'file:///C:/Program%20Files%20(x86)/GOG%20Galaxy/web/main.html'
2019-09-19 22:53:25.636 [Information][ (0)] [TID 183][client_renderer]: Received message: 'sendToJS', from 'browser' process, to browser with ID: 1 with main URL 'file:///C:/Program%20Files%20(x86)/GOG%20Galaxy/web/main.html'
[0919/225325.647:INFO:CONSOLE(1)] "%c21:53:25 %cINFO", source: file:///C:/Program%20Files%20(x86)/GOG%20Galaxy/web/scripts/mainOur.js (1)
2019-09-19 22:53:25.653 [Information][ (0)] [TID 183][client_renderer]: OnContextReleased for browser 1 and frame with URL: https://embed.gog.com/library/windows
2019-09-19 22:53:25.668 [Information][ (0)] [TID 183][client_renderer]: Context created for iframe with URL about:blank
2019-09-19 22:53:25.673 [Information][ (0)] [TID 9][galaxy_client]: [JS] Unloaded webContent after a 0 second delay (request reason: 'game started').
2019-09-19 22:53:25.679 [Information][ (0)] [TID 183][client_renderer]: Received message: 'sendToJS', from 'browser' process, to browser with ID: 1 with main URL 'file:///C:/Program%20Files%20(x86)/GOG%20Galaxy/web/main.html'
2019-09-19 22:53:25.679 [Information][ (0)] [TID 376][galaxy_client]: Starting service 'GalaxyClientService' asynchronously.
2019-09-19 22:53:25.680 [Information][ (0)] [TID 183][client_renderer]: Received message: 'sendToJS', from 'browser' process, to browser with ID: 1 with main URL 'file:///C:/Program%20Files%20(x86)/GOG%20Galaxy/web/main.html'
2019-09-19 22:53:25.682 [Information][ (0)] [TID 376][galaxy_client]: Preparing service to query process information for 12 processes.
2019-09-19 22:53:25.683 [Information][ (0)] [TID 376][galaxy_client]: Requesting data for query process information.
2019-09-19 22:53:25.684 [Information][ (0)] [TID 376][galaxy_client]: Sending message of type 7 [Sequence Number: 3204700875], rseq 0, size 43 (bytes sent: 43), completed OK
2019-09-19 22:53:25.688 [Information][ (0)] [TID 376][galaxy_client]: Request sent [Sequence Number: 3204700875], waiting for response...
2019-09-19 22:53:26.447 [Information][ (0)] [TID 376][galaxy_client]: Received data for query process information.
2019-09-19 22:53:26.449 [Information][ (0)] [TID 376][galaxy_client]: Adding location 'C:\users\user\My Documents\\The Witcher 3' (name: 'saves') to storage sync request for product '1207664643'.
2019-09-19 22:53:26.450 [Information][ (0)] [TID 376][galaxy_client]: Adding SDK namespace with path '' to cloud storage sync request for product '1207664643'.
2019-09-19 22:53:26.451 [Information][ (0)] [TID 376][galaxy_client]: Requesting cloud sync for product '1207664643' with installation ID 2232487669935048313.
2019-09-19 22:53:26.501 [Information][SubSystem installer thread (4)] [TID 62][galaxy_client]: Retrieved valid product auth info for '1207664643' from the database.
2019-09-19 22:53:26.502 [Information][SubSystem installer thread (4)] [TID 62][galaxy_client]: Fetching product configuration for '1207664643'.
2019-09-19 22:53:26.565 [Information][Comm Service Socket Reactor (1)] [TID 310][galaxy_client]: Sending StartStorageSynchronizationRequest [oseq: 4066969583] to Communication Service.
2019-09-19 22:53:26.566 [Information][Comm Service Socket Reactor (1)] [TID 310][galaxy_client]: Sending message of type 51 [Sequence Number: 4066969583], rseq 0, size 181 (bytes sent: 181), completed OK
2019-09-19 22:53:26.711 [Information][Comm Service Socket Reactor (1)] [TID 310][galaxy_client]: 'StartStorageSynchronizationRequest' [rseq: 4066969583] was successful.
2019-09-19 22:53:26.774 [Information][ (0)] [TID 9][galaxy_client]: Started storage sync for product '1207664643'.
2019-09-19 22:53:27.274 [Information][ (0)] [TID 183][client_renderer]: Received message: 'sendToJS', from 'browser' process, to browser with ID: 1 with main URL 'file:///C:/Program%20Files%20(x86)/GOG%20Galaxy/web/main.html'
2019-09-19 22:53:27.404 [Information][SubSystem installer thread (4)] [TID 62][galaxy_client]: Serializing valid product configuration for '1207664643'.
2019-09-19 22:53:27.456 [Information][SubSystem installer thread (4)] [TID 62][galaxy_client]: ClientTask finished: SingleProductCheckTask
2019-09-19 22:53:30.379 [Information][ (0)] [TID 183][client_renderer]: Received message: 'sendToJS', from 'browser' process, to browser with ID: 1 with main URL 'file:///C:/Program%20Files%20(x86)/GOG%20Galaxy/web/main.html'
2019-09-19 22:53:33.973 [Information][ (0)] [TID 9][galaxy_client]: Cloud sync for product '1207664643' succeeded.
2019-09-19 22:53:34.062 [Information][Asynchronous Process Thread (61)] [TID 383][galaxy_client]: Launching process. Command: C:\Program Files (x86)\GOG Galaxy\Games\The Witcher 3 Wild Hunt\bin\x64\witcher3.exe, Initial Directory: C:\Program Files (x86)\GOG Galaxy\Games\The Witcher 3 Wild Hunt\bin\x64, Elevation Mode: DontChange, Arguments: {  }
2019-09-19 22:53:34.076 [Information][ (0)] [TID 9][galaxy_client]: Cloud sync for product 1207664643 succeeded but it was not full (push & pull). Will not change last cloud sync success or failure timestamps.
2019-09-19 22:53:34.174 [Information][ (0)] [TID 183][client_renderer]: Received message: 'sendToJS', from 'browser' process, to browser with ID: 1 with main URL 'file:///C:/Program%20Files%20(x86)/GOG%20Galaxy/web/main.html'
2019-09-19 22:53:34.221 [Information][Asynchronous Process Thread (61)] [TID 383][galaxy_client]: The game 1207664643 has started with PID 384 and is not elevated.
2019-09-19 22:53:34.262 [Information][ (0)] [TID 376][galaxy_client]: Tracking game session for 'The Witcher 3: Wild Hunt' (1207664643) under PID 384.
2019-09-19 22:53:34.398 [Information][Comm Service Socket Reactor (1)] [TID 310][galaxy_client]: Sending StartGameSessionRequest [oseq: 4248364931] to Communication Service.
2019-09-19 22:53:34.399 [Information][Comm Service Socket Reactor (1)] [TID 310][galaxy_client]: Sending message of type 49 [Sequence Number: 4248364931], rseq 0, size 19 (bytes sent: 19), completed OK
2019-09-19 22:53:34.400 [Information][Comm Service Socket Reactor (1)] [TID 310][galaxy_client]: 'StartGameSessionRequest' [rseq: 4248364931] was successful.
2019-09-19 22:53:34.473 [Information][ (0)] [TID 9][galaxy_client]: StartGameSessionRequest [oseq: 4248364931] for product '1207664643' succeeded for PID 384
ATTENTION: default value of option force_glsl_extensions_warn overridden by environment.
Fatal error in __driConfigOptions line 58, column 0: illegal default value for force_glsl_extensions_warn: True.
wine: Assertion failed at address 0x7fdc339fd605 (thread 0181), starting debugger...
0184:fixme:thread:create_user_shared_data_thread Creating user shared data update thread.
Unhandled exception: assertion failed in 64-bit code (0x00007fdc339fd605).
Register dump:
 rip:00007fdc339fd605 rsp:000000000212d9a0 rbp:0000000000000000 eflags:00000246 (   - --  I  Z- -P- )
 rax:0000000000000000 rbx:00007fdc339bb740 rcx:00007fdc339fd605 rdx:0000000000000000
 rsi:000000000212d9a0 rdi:0000000000000002  r8:0000000000000000  r9:000000000212d9a0 r10:0000000000000008
 r11:0000000000000246 r12:00005555574a9e10 r13:00005555574a65d0 r14:00005555574a985c r15:000000000000001b
Stack dump:
0x000000000212d9a0:  0000000000000000 0000000000000000
0x000000000212d9b0:  0000000000000000 0000000000000000
0x000000000212d9c0:  0000000000000000 0000000000000000
0x000000000212d9d0:  0000000000000000 0000000000000000
0x000000000212d9e0:  0000000000000000 0000000000000000
0x000000000212d9f0:  0000000000000000 00007fdc33a4c041
0x000000000212da00:  0000000000000000 00005555574a6cd0
0x000000000212da10:  00007fdc33b87a40 00005555574a7c94
0x000000000212da20:  fffffffe7fffffff ffffffffffffffff
0x000000000212da30:  ffffffffffffffff ffffffffffffffff
0x000000000212da40:  ffffffffffffffff ffffffffffffffff
0x000000000212da50:  ffffffffffffffff ffffffffffffffff
Backtrace:
=>0 0x00007fdc339fd605 (0x0000000000000000)
0x00007fdc339fd605: movq	0x0000000000000108(%rsp),%rax
Modules:
Module	Address					Debug info	Name (43 modules)
PE	         2130000-         2328000	Deferred        physx3common_x64
PE	         2330000-         2339000	Deferred        nvcamerasdk64
PE	         2340000-         2425000	Deferred        gfsdk_ssao.win64
PE	        7a850000-        7a858000	Deferred        opengl32
PE	        7b420000-        7b5eb000	Deferred        kernel32
PE	        7bc20000-        7bc35000	Deferred        ntdll
PE	       140000000-       143673000	Deferred        witcher3
PE	       180000000-       180404000	Deferred        d3dcompiler_47
PE	    7fdc30860000-    7fdc30865000	Deferred        uxtheme
PE	    7fdc30f70000-    7fdc30f75000	Deferred        winex11
PE	    7fdc31040000-    7fdc31045000	Deferred        hid
PE	    7fdc31060000-    7fdc31077000	Deferred        setupapi
PE	    7fdc310e0000-    7fdc310ec000	Deferred        dinput8
PE	    7fdc31150000-    7fdc31155000	Deferred        vcomp
PE	    7fdc31170000-    7fdc31193000	Deferred        vcomp110
PE	    7fdc31170000-    7fdc31193000	Deferred        xinput1_3
PE	    7fdc311a0000-    7fdc311a6000	Deferred        imm32
PE	    7fdc311c0000-    7fdc311c4000	Deferred        usp10
PE	    7fdc31210000-    7fdc31265000	Deferred        comctl32
PE	    7fdc31360000-    7fdc3136a000	Deferred        aclui
PE	    7fdc31380000-    7fdc31385000	Deferred        shcore
PE	    7fdc313b0000-    7fdc313bf000	Deferred        shlwapi
PE	    7fdc31420000-    7fdc31d1a000	Deferred        shell32
PE	    7fdc31e80000-    7fdc31e85000	Deferred        d3d9
PE	    7fdc31ee0000-    7fdc31fb4000	Deferred        msvcr110
PE	    7fdc31fe0000-    7fdc3205f000	Deferred        winmm
PE	    7fdc320c0000-    7fdc320ec000	Deferred        ole32
PE	    7fdc32210000-    7fdc32215000	Deferred        dsound
PE	    7fdc32280000-    7fdc3236f000	Deferred        msvcr120
PE	    7fdc323c0000-    7fdc32466000	Deferred        msvcp120
PE	    7fdc324a0000-    7fdc324a6000	Deferred        ws2_32
PE	    7fdc324f0000-    7fdc324f7000	Deferred        dbghelp
PE	    7fdc32590000-    7fdc3259b000	Deferred        rpcrt4
PE	    7fdc32630000-    7fdc32639000	Deferred        wined3d
PE	    7fdc327b0000-    7fdc327b5000	Deferred        dxgi
PE	    7fdc327f0000-    7fdc327f5000	Deferred        d3d11
PE	    7fdc32880000-    7fdc32890000	Deferred        msvcrt
PE	    7fdc32950000-    7fdc32955000	Deferred        version
PE	    7fdc32970000-    7fdc3297b000	Deferred        advapi32
PE	    7fdc32a10000-    7fdc32a1c000	Deferred        gdi32
PE	    7fdc32bc0000-    7fdc32cb1000	Deferred        user32
PE	    7fdc33210000-    7fdc33213000	Deferred        wow64cpu
PE	    7fdc33330000-    7fdc33342000	Deferred        kernelbase
Threads:
process  tid      prio (all id:s are in hex)
00000008 GalaxyClient.exe
	["C:\Program Files (x86)\GOG Galaxy\GalaxyClient.exe" /runWithoutUpdating /deelevated]
	00000178    0
	00000167    0
	00000166    0
	00000165    0
	00000164    0
	00000163    0
	00000162    0
	00000160    0
	0000015e    0
	0000015d    0
	0000015c    0
	0000015b    0
	0000015a    0
	00000159    0
	00000158    0
	00000136    0
	000000ba    0
	000000b5    0
	000000b4    0
	000000b3    0
	000000b2    0
	000000b1    0
	000000b0    0
	000000af   -2
	000000ae    0
	000000ad    0
	000000ac    0
	000000ab    0
	000000a7    0
	000000a6    0
	000000a5    0
	000000a4   -2
	000000a3    0
	000000a2    0
	000000a1    0
	000000a0    0
	0000009f    0
	0000009e   -2
	0000009d   -2
	0000009c    0
	0000009b    0
	0000009a    0
	00000099    0
	00000098    0
	00000096    0
	00000095    0
	0000007a    0
	00000079    0
	00000078    0
	00000077    0
	00000076    0
	00000075    0
	00000074    0
	00000073    0
	00000072    0
	00000071    0
	00000070    0
	0000006f    0
	0000006e    0
	0000006d    0
	0000006c    0
	0000006b    0
	0000006a    0
	00000069    0
	00000068    0
	00000067    0
	00000066    0
	00000065    0
	00000064    0
	00000063    0
	00000042    0
	00000041    0
	00000040    0
	0000003f    0
	0000003e    0
	0000003d    0
	0000003c    0
	00000030    0
	00000009    0
0000000e services.exe
	[C:\windows\system32\services.exe]
	00000038    0
	00000027    0
	00000023    0
	0000001a    0
	00000013    0
	00000010    0
	0000000f    0
00000011 plugplay.exe
	[C:\windows\system32\plugplay.exe]
	00000017    0
	00000016    0
	00000012    0
00000018 winedevice.exe
	[C:\windows\system32\winedevice.exe]
	0000002a    0
	00000029    0
	00000020    0
	0000001f    0
	0000001e    0
	0000001d    0
	0000001c    0
	0000001b    0
	00000019    0
00000021 winedevice.exe
	[C:\windows\system32\winedevice.exe]
	00000025    0
	00000024    0
	00000022    0
0000002b explorer.exe
	[C:\windows\system32\explorer.exe /desktop]
	0000002f    0
	0000002e    0
	0000002d    0
	0000002c    0
00000036 GalaxyClientService.exe
	["C:\Program Files (x86)\GOG Galaxy\GalaxyClientService.exe"]
	0000003b    0
	0000003a    0
	00000039    0
	00000037    0
0000008a GalaxyCommunication.exe
	["C:\ProgramData\GOG.com\Galaxy\redists\GalaxyCommunication.exe"]
	000000c6    0
	000000c5    0
	000000c4    0
	000000c3    0
	000000c2    0
	000000c1    0
	000000c0    0
	000000bf    0
	00000092    0
	00000091    0
	00000090    0
	0000008c    0
	0000008b    0
000000b6 GalaxyClient Helper.exe
	["C:\Program Files (x86)\GOG Galaxy\GalaxyClient Helper.exe" --type=renderer --no-sandbox --autoplay-policy=no-user-gesture-required --js-flags=--expose-gc --field-trial-handle=1096,16428082847162192335,12426951146117879488,131072 --service-pipe-token=4741440488850593162 --lang=en-US --log-file="C:\ProgramData\GOG.com\Galaxy\logs\cef.log" --log-severity=info --user-agent="GOGGalaxyClient/1.2.58.220 (win7 x64)" --disable-pdf-extension --disable-spell-checking --uncaught-exception-stack-size=999 --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --service-request-channel-token=4741440488850593162 --renderer-client-id=3 --mojo-platform-channel-handle=1548 /prefetch:1]
	0000016a    0
	00000169    0
	000000eb    0
	000000ea    0
	000000e9    0
	000000e8    0
	000000e7    0
	000000e6    0
	000000e5   -2
	000000e4    0
	000000e3    0
	000000e2    0
	000000e1    0
	000000d9    0
	000000d6    0
	000000d5    0
	000000d4    0
	000000d3    0
	000000d2   -2
	000000d1   -2
	000000d0    0
	000000cf    0
	000000ce    0
	000000cd    0
	000000cc    0
	000000b7    0
000000bb GOG Galaxy Notifications Renderer.exe
	["C:\Program Files (x86)\GOG Galaxy\GOG Galaxy Notifications Renderer.exe"]
	00000133    0
	0000012e    0
	0000012b    0
	0000012a    0
	00000126    0
	00000123    0
	00000122    0
	00000121    0
	00000120    0
	0000011f    0
	0000011e    0
	0000011d    0
	0000011c   -2
	0000011b    0
	0000011a    0
	00000119    0
	00000118    0
	0000010d    0
	0000010c    0
	0000010b    0
	0000010a    0
	00000109    0
	00000108    0
	00000107    0
	00000106    0
	00000105    0
	00000104    0
	00000103    0
	00000102    0
	00000101    0
	000000ff    0
	000000fe   -2
	000000fd    0
	000000fc    0
	000000fa    0
	000000f9    0
	000000f8    0
	000000f7    0
	000000f6   -2
	000000f5    0
	000000f4    0
	000000f3    0
	000000f2    0
	000000f1    0
	000000f0    0
	000000ef    0
	000000e0   -2
	000000df   -2
	000000de    0
	000000dd    0
	000000dc    0
	000000db    0
	000000da    0
	000000d8    0
	000000d7    0
	000000bc    0
000000bd GalaxyClient Helper.exe
	["C:\Program Files (x86)\GOG Galaxy\GalaxyClient Helper.exe" --type=renderer --no-sandbox --autoplay-policy=no-user-gesture-required --js-flags=--expose-gc --field-trial-handle=1096,16428082847162192335,12426951146117879488,131072 --service-pipe-token=1542657556928130906 --lang=en-US --log-file="C:\ProgramData\GOG.com\Galaxy\logs\cef.log" --log-severity=info --user-agent="GOGGalaxyClient/1.2.58.220 (win7 x64)" --disable-pdf-extension --disable-spell-checking --uncaught-exception-stack-size=999 --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --service-request-channel-token=1542657556928130906 --renderer-client-id=4 --mojo-platform-channel-handle=544 /prefetch:1]
	00000168    0
	00000132    0
	00000131    0
	00000130    0
	0000012f    0
	0000012d    0
	0000012c    0
	00000129   -2
	00000128    0
	00000127    0
	00000125    0
	00000124    0
	00000117    0
	00000116    0
	00000115    0
	00000114    0
	00000113    0
	00000112   -2
	00000111   -2
	00000110    0
	0000010f    0
	0000010e    0
	00000100    0
	000000fb    0
	000000be    0
00000145 GalaxyClient Helper.exe
	["C:\Program Files (x86)\GOG Galaxy\GalaxyClient Helper.exe" --type=gpu-process --field-trial-handle=1096,16428082847162192335,12426951146117879488,131072 --no-sandbox --log-file="C:\ProgramData\GOG.com\Galaxy\logs\cef.log" --log-severity=info --user-agent="GOGGalaxyClient/1.2.58.220 (win7 x64)" --lang=en-US --gpu-preferences=KAAAAAAAAACAAwCAAQAAAAAAAAAAAGAAAAAAAAAAAAAIAAAAAAAAACgAAAAEAAAAIAAAAAAAAAAoAAAAAAAAADAAAAAAAAAAOAAAAAAAAAAQAAAAAAAAAAAAAAAFAAAAEAAAAAAAAAAAAAAABgAAABAAAAAAAAAAAQAAAAUAAAAQAAAAAAAAAAEAAAAGAAAA --use-gl=swiftshader-webgl --log-file="C:\ProgramData\GOG.com\Galaxy\logs\cef.log" --log-severity=info --user-agent="GOGGalaxyClient/1.2.58.220 (win7 x64)" --lang=en-US --service-request-channel-token=11757062579779063667 --mojo-platform-channel-handle=1132 /prefetch:2]
	00000157    0
	00000156    0
	00000151    0
	00000150    0
	0000014f    0
	0000014e   -2
	0000014d   -2
	0000014c    0
	0000014b    0
	0000014a    0
	00000148    0
	00000147    0
	00000146    0
00000180 (D) C:\Program Files (x86)\GOG Galaxy\Games\The Witcher 3 Wild Hunt\bin\x64\witcher3.exe
	["C:\Program Files (x86)\GOG Galaxy\Games\The Witcher 3 Wild Hunt\bin\x64\witcher3.exe" ]
	00000185    0
	00000181    0 <==
System information:
    Wine build: wine-4.12.1.r1.gaccf1895 ( TkG Staging Esync )
    Platform: x86_64
    Version: Windows 7
    Host system: Linux
    Host version: 5.2.14-200.fc30.x86_64
2019-09-19 22:53:36.266 [Information][ (0)] [TID 376][galaxy_client]: Attaching overlay to 1207664643's process 384.
2019-09-19 22:53:36.267 [Information][ (0)] [TID 376][galaxy_client]: Using default overlay injection method.
2019-09-19 22:53:36.268 [Information][Asynchronous Process Thread (62)] [TID 390][galaxy_client]: Launching process. Command: C:\ProgramData\GOG.com\Galaxy\redists\overlay\GalaxyOverlay.exe, Initial Directory: C:/ProgramData/GOG.com/Galaxy/redists/overlay, Elevation Mode: DontChange, Arguments: { --advanced-features --startoverlay --startup-url="file:///C:/Program%20Files%20(x86)/GOG%20Galaxy/web/overlay.html" --product-id=1207664643 --client-language-code=en-US --attached-pid=384 --cache-path="C:\ProgramData\GOG.com\Galaxy\webcache\1207664643-overlay" --screenshot-path="C:\users\user\My Documents\GOG Galaxy\Screenshots\The Witcher 3 Wild Hunt" }
2019-09-19 22:53:36.326 [Information][Asynchronous Process Thread (62)] [TID 390][galaxy_client]: The overlay for the product 1207664643 has started with PID 391 and was not elevated.
2019-09-19 22:53:36.433 [Information][ (0)] [TID 376][galaxy_client]: Starting service 'GalaxyClientService' asynchronously.
2019-09-19 22:53:36.436 [Information][ (0)] [TID 376][galaxy_client]: Preparing service to query process information for 13 processes.
2019-09-19 22:53:36.437 [Information][ (0)] [TID 376][galaxy_client]: Requesting data for query process information.
2019-09-19 22:53:36.438 [Information][ (0)] [TID 376][galaxy_client]: Sending message of type 7 [Sequence Number: 453045024], rseq 0, size 46 (bytes sent: 46), completed OK
2019-09-19 22:53:36.439 [Information][ (0)] [TID 376][galaxy_client]: Request sent [Sequence Number: 453045024], waiting for response...
2019-09-19 22:53:36.585 [Information][ (0)] [TID 376][galaxy_client]: Received data for query process information.
2019-09-19 22:53:36.660 [Information][ (0)] [TID 376][galaxy_client]: Starting service 'GalaxyClientService' asynchronously.
2019-09-19 22:53:36.663 [Information][ (0)] [TID 376][galaxy_client]: Preparing service to query process information for 13 processes.
2019-09-19 22:53:36.665 [Information][ (0)] [TID 376][galaxy_client]: Requesting data for query process information.
2019-09-19 22:53:36.665 [Information][ (0)] [TID 376][galaxy_client]: Sending message of type 7 [Sequence Number: 145717619], rseq 0, size 45 (bytes sent: 45), completed OK
2019-09-19 22:53:36.666 [Information][ (0)] [TID 376][galaxy_client]: Request sent [Sequence Number: 145717619], waiting for response...
2019-09-19 22:53:36.667 [Information][ (0)] [TID 376][galaxy_client]: Received data for query process information.
2019-09-19 22:53:36.668 [Information][ (0)] [TID 376][galaxy_client]: Starting cloud sync after game '1207664643' ended.
2019-09-19 22:53:36.670 [Information][ (0)] [TID 376][galaxy_client]: Cloud saves for the user is allowed as it is enabled for all.
2019-09-19 22:53:36.738 [Information][ (0)] [TID 376][galaxy_client]: Starting service 'GalaxyClientService' asynchronously.
2019-09-19 22:53:36.741 [Information][ (0)] [TID 376][galaxy_client]: Preparing service to query process information for 13 processes.
2019-09-19 22:53:36.742 [Information][ (0)] [TID 376][galaxy_client]: Requesting data for query process information.
2019-09-19 22:53:36.743 [Information][ (0)] [TID 376][galaxy_client]: Sending message of type 7 [Sequence Number: 3540040434], rseq 0, size 46 (bytes sent: 46), completed OK
2019-09-19 22:53:36.743 [Information][ (0)] [TID 376][galaxy_client]: Request sent [Sequence Number: 3540040434], waiting for response...
2019-09-19 22:53:36.744 [Information][ (0)] [TID 376][galaxy_client]: Received data for query process information.
2019-09-19 22:53:36.745 [Information][ (0)] [TID 376][galaxy_client]: Adding location 'C:\users\user\My Documents\\The Witcher 3' (name: 'saves') to storage sync request for product '1207664643'.
2019-09-19 22:53:36.746 [Information][ (0)] [TID 376][galaxy_client]: Adding SDK namespace with path '' to cloud storage sync request for product '1207664643'.
2019-09-19 22:53:36.747 [Information][ (0)] [TID 376][galaxy_client]: Requesting cloud sync for product '1207664643' with installation ID 2232487669935048313.
2019-09-19 22:53:36.904 [Information][Comm Service Socket Reactor (1)] [TID 310][galaxy_client]: Sending StartStorageSynchronizationRequest [oseq: 3152296178] to Communication Service.
2019-09-19 22:53:36.905 [Information][Comm Service Socket Reactor (1)] [TID 310][galaxy_client]: Sending message of type 51 [Sequence Number: 3152296178], rseq 0, size 181 (bytes sent: 181), completed OK
2019-09-19 22:53:36.975 [Information][Comm Service Socket Reactor (1)] [TID 310][galaxy_client]: 'StartStorageSynchronizationRequest' [rseq: 3152296178] was successful.
2019-09-19 22:53:37.074 [Information][ (0)] [TID 9][galaxy_client]: Started storage sync for product '1207664643'.
[0919/225337.217:ERROR:network_change_notifier_win.cc(157)] WSALookupServiceBegin failed with: 0
[0919/225337.223:ERROR:gpu_process_transport_factory.cc(990)] Lost UI shared context.

DevTools listening on ws://127.0.0.1:12346/devtools/browser/1be262fa-e079-447d-bf57-f415bdce36f7
[0919/225337.488:ERROR:url_request_context_getter_impl.cc(130)] Cannot use V8 Proxy resolver in single process mode.
2019-09-19 22:53:38.275 [Information][ (0)] [TID 183][client_renderer]: Received message: 'sendToJS', from 'browser' process, to browser with ID: 1 with main URL 'file:///C:/Program%20Files%20(x86)/GOG%20Galaxy/web/main.html'
2019-09-19 22:53:39.674 [Information][ (0)] [TID 9][galaxy_client]: Cloud sync for product '1207664643' succeeded.
2019-09-19 22:53:39.777 [Information][ (0)] [TID 9][galaxy_client]: Cloud sync for product 1207664643 succeeded. Saving last success timestamp (Thu Sep 19 22:53:39 2019).
2019-09-19 22:53:39.819 [Information][ (0)] [TID 9][galaxy_client]: The game '1207664643' is closed.
2019-09-19 22:53:39.820 [Information][ (0)] [TID 9][galaxy_client]: Skipping storing game session as it was too short (0 minutes).
2019-09-19 22:53:39.821 [Information][ (0)] [TID 9][galaxy_client]: Scheduling single product check task for product game session finished requested for '1207664643'. IgnoreCheckedRecently?: true.
2019-09-19 22:53:39.822 [Information][SubSystem installer thread (4)] [TID 62][galaxy_client]: Starting ClientTask: SingleProductCheckTask
2019-09-19 22:53:39.931 [Information][ (0)] [TID 183][client_renderer]: Received message: 'sendToJS', from 'browser' process, to browser with ID: 1 with main URL 'file:///C:/Program%20Files%20(x86)/GOG%20Galaxy/web/main.html'

It might be there but I cannot tell what the problem could be.
I have Radeon GPU with no extra installed drivers.
Any ideas how to troubleshoot please?

Try seeing if installing these fix your problem.

org.freedesktop.Platform.GL.default
org.freedesktop.Platform.GL32.default
org.freedesktop.Platform.Compat.i386
org.gnome.Platform.Compat.i386

I had all of those already but I tried to install them nonetheless, this time from the beta flathub:
flatpak install flathubbeta org.freedesktop.Platform.GL.default org.freedesktop.Platform.GL32.default org.freedesktop.Platform.Compat.i386 org.gnome.Platform.Compat.i386
It did not help

If you layer Lutris, do you get the same issue?

If it occurs on a non-flatpakked Lutris, it’s an upstream bug. If it doesn’t, you should file it against the Lutris Flatpak.

Are you sure it could work? I thought wine does not run on Silverblue.

Wine does work under Silverblue. When I layered Lutris and Steam, I saw 32bit libs get downloaded and they got placed in /usr/lib.

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