Hey, final update here - I managed to get the game working again! I think a patch came through somewhere that broke something - maybe it was ProtonGE, maybe it was Valve patching Proton Experimental, maybe it was Bethesda putting out something weird in a patch. Regardless, I got a tip that you can upgrade your Linux kernel to 6.5.x, and upgrade to the latest Mesa git drivers. The game is now running smoothly again without any issues on Wayland!