Switching between fullscreen and windowed modes would often not realign UI elements with what was being displayed on the window surface, making it nearly impossible to change settings without killing the game and restarting.

Both Proton 9.0-4 and Experimental would have occasional bouts of oddly paced frames every ten rounds or so. It sort of feels like the frames are being displayed out of order for a few seconds creating a very jittery presentation.

Starting with kernel 6.12.13 amdgpu would get frequent ring timeouts with this game when running it with Proton Experimental. Switching to 9.0-4 would resolve this problem. The ring timeout issue with Experimental appears to be resolved with kernel 6.12.15, although Experimental updated on the same day as that kernel version was available in my distribution, so I can't be entirely sure if it was the kernel or the Experimental update that fixed the problem.