It’s hard to tell what’s going on here in the stack trace but it looks like a missing library.
Can you try adding run-fojo.ps1 as a non-steam game and launch it with linux 1.0 runtime? that should provide the libraries the game needs. If you get crashes (there was proton 1.0 pc port crashes reported a few years back but I think they were fixed) try setting it to 2.0 or 3.0