This is a native vulkan game and there is no graphic api translation happening in proton. This is almost assuredly a Intel driver bug and should be reported to Mesa.
Hello @zottelmann, we're using one issue report per unofficially supported game title, so I've gone ahead and transferred this issue report to https://github.com/ValveSoftware/Proton/issues/7442#issuecomment-2627431452.
Compatibility Report
System Information
GPU: Intel Arc a750 Limited Edition
Video driver version: Mesa Intel(R) Arc(tm) A750 Graphics (DG2) (0x56a1) Version: 24.0.3
Kernel version: Linux pop-os 6.9.3-76060903-generic
Link to full system information report as Gist:https://gist.github.com/zottelmann/36f93106fc90f06791480b440aed322b
Proton version: Proton Hotfix/Experimental
I confirm:
Symptoms
Game Starts, but a lot of flickering graphics, missing textures, missing character models (PC, Enemies...) low performance
Tried different Proton Versions, reinstalled Mesa drivers, updated everything. No luck.
Reproduction
Everytime playing the game
Cheers,