Alex

I experienced the same with the Proton Hotfix version in several games. Keyboard strokes are unrecognized also when alt tabbing into another application. Setting Proton 9.0.4 fixes the issue. Obsereved...

After tinkering with several settings, I finally could identify my keyboard being the problem. A cheap keyboard works. Some combination between this keyboard/driver/proton 10x which seems to cause the issue...