Compatibility Report

• Name of the game with compatibility issues: Chivalry: Medieval Warfare
• Steam AppID of the game: 219640

System Information

• GPU: AMD Radeon RX 6800 XT
• Video driver version: Mesa 25.2.8
• Kernel version: 6.12.49-cachyos
• Link to full system information report as [Gist]
• Proton version: 10.0-3

I confirm:

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

[steam-log]

Symptoms

Within the first few seconds of launching, the game freezes for a good 35-60 seconds. Be playable again for a few seconds, then freeze for that solid chunk of time again. Repeatedly.
During the time the game is frozen, CPU usage for the task spikes tremendously (How odd!)
The game still works fine on Windows..

Reproduction

Running the game with proton should suffice. I have other friends with computer specs entirely, different distros, different GPUs, display server, desktop environments/window manager having the same issue.
Chivalry has not received any updates, nor has proton, yet this issue seemingly appeared from nowhere.