I had a very similar issue like this before when Proton was migrating to the Steam Soldier runtime, which then forced the Steam Runtime to be used when running Proton. This was fine, but now I have this same behavior even with the Steam Runtime enabled. All games work as intended with 4.11-13. I have an example log from STALKER: Call of Pripyat in case it might have some clues as to whats going on.
I had a very similar issue like this before when Proton was migrating to the Steam Soldier runtime, which then forced the Steam Runtime to be used when running Proton. This was fine, but now I have this same behavior even with the Steam Runtime enabled. All games work as intended with 4.11-13. I have an example log from STALKER: Call of Pripyat in case it might have some clues as to whats going on.
steam-41700.zip
Here is also a pressure vessel log which may hold more info.
container.log
System info: Gentoo
https://gist.github.com/shoober420/35af31e8e121a2a55a1004a37597ca60