Thank you, it turned out, using the game without forcing compatibility proton layer resolves that issue.

I will consider bazzite for a future installation.

Also, I have a pretty hilarious story connected to this to tell:

I was sitting in voice chat with my friends, and just listening to them. I could not queue up with them, because VAC is making my life harder than it has to be. They joined a premium game and we/they are never cheating. They faced a hacker. Next round, another team member of their team turned on full hack too. Turns out, while I could not play the game without cheats, they were stuck in a HvH game (Hackers with Wallhack/Aimbot on both teams). ¯\_ (ツ)_/¯

Oh… I always used it like this, I didn’t know I can just NOT check the “force compatibility” checkmark. Thank you, that solved the problem.

Error message:

Some of your game files have been detected to have no signatures or invalid signatures. You will not be allowed to join VAC secure servers. Please verify your launch options, check correctness of your game installation, restart the game and try again.

Why does the picture get cut off? 🤬