WoW retail and forever suddenly stopped running - Issue #7002?

Yesterday everything was well, today I tried adding a starter for WoW Forever and I must have changed something important by mistake. Battlenet starts up fine. The error I get when stating any of the games is:

Start monitoring process.
Initial process has exited (return code: 0)
err:   Got allocation from memory type 10 without global buffer
err:   D3D11VideoDevice::GetVideoDecoderProfileCount: Stub
err:   Presenter: Failed to create Vulkan surface: VK_ERROR_OUT_OF_HOST_MEMORY
err:   Failed to create Vulkan surface, VK_ERROR_OUT_OF_HOST_MEMORY
err:   DXGI: CreateSwapChainForHwnd: Failed to create swap chain, hr -2147467259
Monitored process exited.
Exit with return code 0

I haven’t changed anything else, just tried to add the starter. It seems that while doing so Lutris resets the Vulkan/DXVK settings on other starters? Not sure what the right settings were. How can I debug this?
I’m running Debian12 (cannot update for other reasons)

Edit: vulkaninfo tells me I have v. 1.3, and in some backed up old config I had DXVK 1.10.3 so I set that DXVK version in Lutris. Now I’m getting:

Start monitoring process.
Monitored process exited.
No return code

Maybe the other versions need to be changed away from default too? But to what?

I just noticed all my dll overwrites vanished for some reason. I know they were there just an hour ago.

Edit2: vkcube works without issues. I changed DXVK back to standard 2.6 and now I can’t even get the previous error anymore. It’s just start-exit-no return code.

Edit3: I enabled extended debugging and saw this, reproducible with different wine TKG and DXVK versions (even without).

0024:fixme:ntdll:NtQuerySystemInformation info_class SYSTEM_PERFORMANCE_INFORMATION
0024:err:virtual:virtual_setup_exception stack overflow 1792 bytes addr 0x6ffffff59431 stack 0x10900 (0x10000-0x11000-0x110000)
Monitored process exited.

Several debugging hours later I think I was hit by this bug Missing Wine/Proton version silently falls back to GE-Proton (Latest), downloads it and upgrades the existing prefix · Issue #7002 · lutris/lutris · GitHub
My profile has a mixture of proton symlinks and wine tkg files. What now?