DOS2 sound broken

[sumilinux]

Compatibility Report

• Name of the game with compatibility issues: DOS2
• Steam AppID of the game:435150

System Information

• Steamdeck
• Kernel version:
• Link to full system information report as Gist:
• Proton version: 8.04 or 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

Ever since the upgrade to latest proton, the sound for the game is not working.
Tried the following:

1. Restart deck
2. Downgrade and use older proton versions
3. Verify integrity of the game files
4. Reinstall the game.

None of the above restores the sound for the game.

Reproduction

[kisak-valve]

Hello @sumilinux, we're using one issue report per unofficially supported game title, so I've gone ahead and transferred this issue report to #413 (comment).