Rocksmith2014 won't launch native/slr

[Mrjello0]

Compatibility Report

• Name of the game with compatibility issues:Rocksmith 2014
• Steam AppID of the game:221680

System Information

• GPU: < AMD Radeon 780M Graphics [Integrated]>
• Video driver version: <mesa 1:25.3.4-2>
• Kernel version: <Linux 6.18.7-2-cachyos>
• Link to full system information report as Gist:
• Proton version:proton-cachyos 1:10.0.20260101-1 (native)

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.
• [✔️] that I have verified the issue is present when using Proton-CachyOS-SLR from this repository.
• [✔️] that I haven't encountered the issue using an official Proton, such as Proton, Proton Experimental or Proton Bleeding Edge.

• Log from Proton-CachyOS Native (only if relevant)
  steam-221680.log

• Log from Proton-CachyOS-SLR
  steam-221680.log

• Log from recent Proton Experimenta
  steam-221680.log

Symptoms

Instant crash on play
I believe it's related to #65

Reproduction

I believe it's the above issue even though it doesn't appear when I hit play(maybe it does it flashes a dialogue box too quickly to see) because when I run

STEAMLIBRARY="$HOME/.steam/steam/"
PROTON="$HOME/.steam/steam/steamapps/common/Proton - Experimental/files"
WINEPREFIX=$STEAMLIBRARY/steamapps/compatdata/221680/pfx "$PROTON/bin/wine" $STEAMLIBRARY/steamapps/common/Rocksmith2014/Rocksmith2014.exe

this pops up

unrelated but this is why I'm trying out proton-cachyos https://codeberg.org/nizo/linux-rocksmith/issues/106
but I'll just try out the script but yeah unrelated