Veritas Demo crash (1198910)

Compatibility Report

• Name of the game with compatibility issues: Veritas (demo)
• Steam AppID of the game: 1198910

System Information

• GPU: Nvidia 2060
• Driver/LLVM version: 440.48.02
• Kernel version: 5.4.17
• Link to full system information report as Gist: https://gist.github.com/byte1024/e11ee2703ad2bc8037747ff5ccd93408
• Proton version: 5.0-1

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-1198910.log

Symptoms

Game crashes

Reproduction

1. Start demo
2. Get key by using puzzle at door: up right up down right down
3. Use key on lock at barrels in same room
4. Game crashes

Doesn't happen on Windows. Looks to be Wine/Proton problem:

Unhandled exception: page fault on read access to 0x00000000 in 32-bit code (0x6cf8236e).

Backtrace:
=>0 0x6cf8236e in mfreadwrite (+0x236e) (0x0032f180)

I expect full game will crash as well.

Start with the attached steam-1198910.log and reproduce the crash using the listed puzzle and key steps under Proton 5.0-1. The report identifies an unhandled read fault in 32-bit mfreadwrite; use that trace to investigate the failure. Done means the Veritas demo completes these steps without crashing under Proton.