Hello @rifiktor228-source1, we're tracking issues with games run with Proton in the Proton issue tracker. Also, we're using one issue report per unofficially supported game title, so I've gone ahead and transferred this issue report to https://github.com/ValveSoftware/Proton/issues/2704#issuecomment-3831971993.
In general, it's likely you'll have a better experience with the Linux native variant of this game.
At some point, after the next reboot of the game, due to a bug in the sound, an error appeared when starting matchmaking, in the description there was an anti cheat valve offered to check the integrity of the files and run the parameters, I have nothing to use, and all the files successfully passed the check and solved the problem. I reinstalled the game, changed the compatibility, looked for other starting indicators – nothing helped, I hope your help in CachyOS Linux Derequisite.