Marvel's Midnight Suns (368260)

Compatibility Report

• Name of the game with compatibility issues: Marvel's Midnight Suns
• Steam AppID of the game: 368260

System Information

• Steam Deck
• Steam OS Stable, Latest Version
• Proton version: 7.0.5, Experimental

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.

Symptoms

Crashes on end of day.
The game runs on a day by day cycle where after every mission you go to bed and change days. Whenever you try to go to sleep, it hard crashes freezing the deck and requiring power cycling.

Crashes on loading saves

Crashes on manually saving

Save file paths move around preventing syncing
Game moves save file paths move around constantly for seemingly no reason when tweaks are made.
HOWEVER I BELIEVE THIS IS A DEV PROBLEM. I just mention it to be thorough.

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People are reporting contradictory fixes which seem to work for some including forcing dx11 or pining the clocks at 1400mhz, but in general, for most, the game is too unstable to be playable. It's a shame since it works fine in between crashes. It's a stability problem, not so much a performance one, though its not great either.

Reproduction

End of day crash: Finish a mission and send the player character to sleep
Crash on loading/saving: Can happen when doing either. Inconsistent

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No source file or test is identified. Start by reproducing the end-of-day, loading-save, and manual-save crashes on Steam Deck with Steam OS and Proton 7.0.5 or Experimental, then compare the reported DX11 and clock-setting variations. Done means establishing a reproducible cause and documenting a verified compatibility result.