[HL:S][Linux] You are no longer able to play the game

[Snoucher]

System information gist: https://gist.github.com/Snoucher/131581cd21c97aa620ccb30f7959776d
HL:S STEAM_LINUX_RUNTIME_LOG=1 + VERBOSE: https://gist.github.com/Snoucher/2b319d595a65d4d08818f31b0b8891ce
HL:DM:S Same as above: https://gist.github.com/Snoucher/a8f3c6c04c1375e29610fb51afdeaa78

The game is stuck on this loading screen,

I have tried deleting the background maps to see if this fixes it, it doesn't. I have tried the previous build, it doesn't. I have even tried for some reason using steam linux runtime 1.0 as a compatability tool.

I believe it's caused by the 20th anniversary update, since when I played the game through proton, I saw the cyan workshop logs on the console and the brand new "very high" shader setting. I have no other leads than this.

[Snoucher]

There's this rather short steam forum thread where two people have too mentioned the same issue we're currently facing: https://steamcommunity.com/app/280/discussions/0/603015872060193371/

This is probably means that this issue isn't a me problem.