Doom (379720): "Switch weapon mod" action unresponsive

Compatibility Report

• Name of the game with compatibility issues: Doom
• Steam AppID of the game: 379720

System Information

• GPU: ASUS GeForce RTX 3060 Ti DUAL OC V2
• Driver/LLVM version: nvidia-driver-510
• Kernel version: 5.15.0-25-generic
• Link to full system information report as Gist:
• Proton version: 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.

Please add PROTON_LOG=1 %command% to the game's launch options and
attach the generated $HOME/steam-$APPID.log to this issue report as a file.
(Proton logs compress well if needed.)

Tried this, but no log file was generated.

Symptoms

Everything works just fine, except for the "Switch weapon mod" action. No matter what key or mouse button I bind this to, it never works. Nothing happens when I try to trigger it, and I'm stuck with whatever weapon mod I purchased last - unable to switch back and forth.

Start by reproducing Doom (Steam AppID 379720) with Proton Experimental and the reported “Switch weapon mod” binding. Retry with PROTON_LOG=1 %command% and investigate why no steam-379720.log is generated. Done means the action switches weapon mods correctly under Proton, with logs available if the issue persists.