If you tried a bunch of other proton versions, you may need to clear the compatdata dir for the game and then run again with experimental. The directory can get in a weird state with some games if you try to run multiple proton versions - i.e. one applies a fix on startup that breaks it in another version.
Try using Proton Experimental.
Tried it. Also a whole bunch of other versions incl GE.
Found someone on Facebook with the same problem so at least it’s not just me eh?!
Looks like we’ve both got Cryotools and decky power tools installed so it could be that.
Given I uninstalled it and its huge I cant check that just yet though.
If you tried a bunch of other proton versions, you may need to clear the compatdata dir for the game and then run again with experimental. The directory can get in a weird state with some games if you try to run multiple proton versions - i.e. one applies a fix on startup that breaks it in another version.