Hello @Vash63, we're tracking issues with game mods with the game being modified. Also, 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/1534#issuecomment-2295254691.
Compatibility Report
System Information
I confirm:
steam-2280.log
Symptoms
Game fails to launch due to missing Vulkan extension in winevulkan

Reproduction
Download and unzip: https://github.com/vs-shirokii/gzdoom-rt/
Install Doom I & II on Steam (appid 2280)
Copy DOOM2.wad into gzdoom-rt directory
Set Steam launch options to target gzdoom instead of default, i.e. (adjust paths as needed):