I’m running a Radeon 6770 on my home machine, running Mint and running Baulder’s Gate 3 under Steam, and have been having some surfaces sparkle or not show correctly when running it with Vulkan in Proton, though everything looks perfect when using DirectX. It also looks correct in both modes when run on Steam deck. What is this phenomenon, just a bug in my graphics driver and Vulkan? None of my other games exhibit this issue.
This should be less the window server than the gfx API at play. I’d say force DirectX if you think that looks better visually.