@simifor Every other game runs fine. The message in the image I shared only appears when selecting Linux Runtime (scout). I unchecked the box and checked it again. It switched from Proton9 to Scout, again raising the sam...
Linux has some long term support releases (LTS) the latest one is the 6.12.x branch, I wouldn't expect that to be any less stable than what you have right now but mint lags a bit behind by design so they might not offer ...
@simifor are you sure I should upgrade my kernel? It seems to be the most recent stable version and I read getting the newest will most likely introduce new issues, also I can`t seem to upgrade to 6.9 nor 6.10.  with the same problem on Steam Community forum.