Euro Truck Simulator 2 (227300)

Compatibility Report

• Name of the game with compatibility issues: Euro Truck Simulator 2
• Steam AppID of the game: 227300

System Information

• GPU: < Sapphire RX 470 4 GB>
• Driver/LLVM version: Mesa 21.1.6/4.6
• Kernel version: 5.13.7-zen1-1-zen x86_64
• Link to full system information report as Gist: https://gist.github.com/fluttirci/8c5c66f9c35903764913d9b131f4f8ce
• Proton version: Experimental, 6.3, 5.13.6

I confirm: TO THESE.

• [Y ] that I haven't found an existing compatibility report for this game.
• [ Y] that I have checked whether there are updates for my system available.

This is that .log file you need:
https://gist.github.com/fluttirci/17e26a704fb82fc55222dd7d68d680b0

Symptoms

It won't run, the play button turns to stop, it keeps that way for a long while, more than 20 minutes. It won't open.

Reproduction

Linux version just works, but whenever I force compatibility, it won't work. I had the same problem 2 months ago, but that time it was pop os. Now archlinux. Here this one: https://github.com/ValveSoftware/Proton/issues/4817
That fix doesn't work for me now though.

Start by reviewing the linked log Gist, the full system information Gist, and the referenced issue #4817. Reproduce the launch failure with the listed Proton versions on Arch Linux and compare it with the working native Linux version. Done means identifying a confirmed cause or a reproducible compatibility fix for Euro Truck Simulator 2.