if you are having weird bugs when playing via Proton, report the issue on the Proton GitHub page. If it’s a graphical glitch you can also report it to proton-vkd3d or DXVK depending on which one is being used by the game. If unsure just report it only to Proton.
The Proton developers and the developers of associated projects (DXVK, vkd3d, etc) will often add workarounds into the various parts of the Proton platform to get a game to work correctly, even if the problem you are seeing is a game bug or driver bug.
I played over two hundred hours of the steam version on Proton 8