Howdy,
I read about better support for gaming on asahi so I rushed to try it out, however games miss 3/4 of screen (as shown in picture). Have anyone come across something similar? Is there any solution?
Please let me know if I can post some valuable logs.
Thanks for your help in advance.
Heh, I ran into something very similar 
I'm on the Fedora Silverblue 41 Beta - #2 by Espionage724
For me that only happens with WoW, and I launch it first-time windowed (-windowed flag), and then switch it back to fullscreen in-game. Only the first-time fullscreen start does the small-box thing oddly on Wayland (not GNOME on Xorg).
Not too sure if your game has a particular windowed-mode launch flag, but maybe forcing a Wine virtual desktop would be similar.