Summer Funland (780280)

Compatibility Report

• Name of the game with compatibility issues: Summer Funland
• Steam AppID of the game: 780280

System Information

• GPU: GeForce RTX 2080
• Driver/LLVM version: nvidia-dkms-440.36-4
• Kernel version: 5.4.1-arch1-2
• Proton version: 4.11-9

I confirm:

• [* ] that I haven't found an existing compatibility report for this game.
• [*] that I have checked whether there are updates for my system available.

steam-780280.log

Symptoms

The game refuses to start when SteamVR is enabled and the hmd (Valve Index, but same with previous HTC Vive) is ready and crashes with useless UE4 Error requester,

When SteamVR is disabled the game starts normally on the desktop and can be controlled a bit with mouse and space. It is a VR only game.
Just in case it is useful, here's the log of the game started without SteamVR:
steam-780280-withoutVR.log

Reproduction

see above

Start by comparing steam-780280.log with steam-780280-withoutVR.log and reproduce the crash with SteamVR enabled and the Valve Index or HTC Vive ready. The issue is resolved when Summer Funland starts successfully in VR under Proton without the UE4 error requester.