This might be a issue, I’m not sure, but I don’t run wayland and don’t play CS:GO.
When logging in you can choose the session type from the gdm login screen, (cogwheel) choose classic, this will log you into a x11 session and check if that makes a difference.
How to find out what kind of session you are running:
Info from the proton DB, that always helps me get games to run since there are so much tips and examples.