Hello @mxmeinhold, 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/8009#issuecomment-3494244179.
apologies! I had searched for it and not seen anything, thank you for transferring!
Compatibility Report
System Information
I confirm:
Symptoms
Game runs fine in desktop mode
Game starts fine in VR mode, but as soon as you select "start game" (either campaign or custom) the VR display freezes. The monitor view however successfully shows the loading screen and loads into the game world, and will continue tracking the view angle of the headset and the positions of controllers
steam-1489630.log
Reproduction