Shin Megami Tensei III Nocturne HD Remaster (1413480)

Compatibility Report

• Name of the game with compatibility issues: Shin Megami Tensei III Nocturne HD Remaster
• Steam AppID of the game: 1413480

System Information

• GPU: RX 5700XT
• Driver/LLVM version: Mesa 21.1.0
• Kernel version: 5.12.5-zen1-1-zen
• Link to full system information report as Gist: https://gist.github.com/junglerobba/a6bd50285901ea36986ea62a63e6f57f
• Proton version: Proton Experimental (experimental-6.3-20210517)

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-1413480.log

Symptoms

Game runs fine (Videos are just the test image, but they are skippable just fine), except that entering save rooms often causes the game to remain on a black screen, after which the process has to be killed. This unfortunately makes this game almost unplayable.

One thing to note is, the game seems to be locked to 30 FPS on Windows, but enabling Vsync on Proton makes it run at 60. The issue happens regardless of framerate though.

Also cloud saves do not seem to be working, though I'm not sure if this is a configuration issue with the game or actually caused by running the game via Proton.
EDIT: Cloud saves are uploaded when running the game on Windows, so that's indeed a Proton issue.

Reproduction

Play the game up until the first save room (room with the cylinder, about 10-15 minutes in), keep reentering the room until the game remains on a black screen (generally happened to me on the 2nd try)

Start by reproducing the black screen in the first save room using the listed system configuration and Proton Experimental, then inspect steam-1413480.log alongside the linked system information report. Done means repeated entry into the save room no longer leaves the game on a black screen; cloud-save behavior is also reported separately in the issue.