Ok, just checked the game's updates on SteamDB --- https://steamdb.info/app/1707990/history/ -- last content update was in June 11 and I played the game after this (got my achievement on June 28).
Also checked the error on proton log and I see that the line with XR_ERROR_CALL_ORDER_INVALID in xrBeginFrame: xrBeginFrame without xrWaitFrame from WiVRn/monado comes from https://github.com/mateosss/monado/commits/mateosss/qwerty/src/xrt/state_trackers/oxr/oxr_session.c which hasn't seen an update since Feb 16, 2021.
I'm puzzled on what might have caused the game to break.
Oh, I was looking at the wrong repository for monado. The right one is https://gitlab.freedesktop.org/monado/monado/-/blob/main/src/xrt/state_trackers/oxr/oxr_session.c?ref_type=heads and it had newer updates.
Apologies. It seems the error comes from WiVRn, not proton. In any fashion, ALVR doesn't work with the game.
Skydance's Behemoth crash on certain levels
Issue transferred from https://github.com/ValveSoftware/Proton/issues/9539.
@cmleon51 posted on 2026-03-02T05:12:41:
When certain levels load the game completely crashes except when you add "-dx12" to the launch options of the game
Play the game and enter the level called "bone cathedral" from the previous level (the problem arises in the castle too but bone cathedral it's the first level where this happens
Hello @cmleon51, these look like some lines of interest from your Proton log:
radv/amdgpu: The CS has been cancelled because the context is lost. This context is innocent.
radv: GPUVM fault detected at address 0x8001492d5000.
GCVM_L2_PROTECTION_FAULT_STATUS: 0x601031
CLIENT_ID: (TCP) 0x8
MORE_FAULTS: 1
WALKER_ERROR: 0
PERMISSION_FAULTS: 3
MAPPING_ERROR: 0
RW: 0
2295.592:0164:0210:warn:seh:OutputDebugStringW L"LowLevelFatalError [File:C:\\SDI\\Jenkins\\perforce\\bhm_ue5-stage-new\\Engine\\Source\\Runtime\\Windows\\D3D11RHI\\Private\\D3D11Util.cpp] [Line: 261] \nResult failed with error DXGI_ERROR_INVALID_CALL\n at C:\\SDI\\Jenkins\\perforce\\bhm_ue5-stage-new\\Engine\\Source\\Runtime\\Windows\\"...
err: DxvkSubmissionQueue: Command submission failed: VK_ERROR_DEVICE_LOST
2295.592:0164:0210:warn:seh:dispatch_exception L"LowLevelFatalError [File:C:\\SDI\\Jenkins\\perforce\\bhm_ue5-stage-new\\Engine\\Source\\Runtime\\Windows\\D3D11RHI\\Private\\D3D11Util.cpp] [Line: 261] \nResult failed with error DXGI_ERROR_INVALID_CALL\n at C:\\SDI\\Jenkins\\perforce\\bhm_ue5-stage-new\\Engine\\Source\\Runtime\\Windows\\"...
This issue should also be mentioned to your video driver vendor if it hasn't been already.
Compatibility Report
System Information
I confirm:
Symptoms
The game correctly starts in VR and shows the Skydance logo and then the Unreal logo, then goes back although it keeps playing the background music, like if something was running but not displayed. Pressing a button also generates a sound, but nothing appears.
Reproduction
steam-1707990.log
Notes
In the past this game was starting correctly on Linux. Maybe an update broke it.