Proton (Steam) DirectX 12

I’m trying to use Proton to play some DX 2 games.
I play a lot of them on Ubuntu and Manjaro, but no DX12 game works on Fedora 34 or 35 for me.
DX11, 10 and 9 works just fine, but every game I try that requires DX12 either just crashes or tells me that my RTX 2070 doesn’t support DX12.
I’ve tried the 470 NVidia drivers and 495 drivers (both installed via the Software Store’s Third-Party repos), but DX12 never works.
Steam is not installed as a Flatpak.

How can I fix this?