What gpu do you have? Have you checked protondb? What version of proton do you have selected for steam play? What version of steam are you using? Flatpak, deb/rpm or snap?
I’m using Proton Experimental. While I have checked ProtonDB, I wasn’t able to find a solution.
I did find that quite a large number of people suggested I put the following in the launch options:
for var in $(printenv | cut -d= -f1); do export $var=$(echo ${!var} | rev | cut -c1-1000 | rev); done ; OPENSSL_ia32cap=~0x20000000 %command% -window -noborder
But it didn’t change anything.
Sorry, forgot about that. I’m using the latest steam beta, at the time of writing.