Overcooked 2 crashing just seconds after launch

Hello, I've been trying to play Overcooked 2 through Heroic.
I'm running EndeavourOS (Arch).
Now my brother owns this game through Steam and it works fine with Proton 9.4 there, but since we want to play together I can't use his version.

When I try to launch Overcooked with the latest GE Proton version, the game launches successfully and shows the login screen for a few seconds, before crashing. When starting Heroic through command line, I get this error, which leads to the game crash:
(15:34:10) INFO: [Backend]: Stopping Display Power Saver Blocker
[108690:0531/153410.076695:ERROR:content/browser/browser_main_loop.cc:278] Gtk: gtk_widget_add_accelerator: assertion 'GTK_IS_ACCEL_GROUP (accel_group)' failed
[108690:0531/153410.076740:ERROR:content/browser/browser_main_loop.cc:278] Gtk: gtk_widget_add_accelerator: assertion 'GTK_IS_ACCEL_GROUP (accel_group)' failed
[108690:0531/153410.076774:ERROR:content/browser/browser_main_loop.cc:278] Gtk: gtk_widget_add_accelerator: assertion 'GTK_IS_ACCEL_GROUP (accel_group)' failed

I've tried using different Proton versions, and using the environment variable PROTON_USE_WINED3D, also using the Steam Runtime, but no combination of settings worked. I also reinstalled Heroic a few times.

It's honestly silly how much time I've spent trying to get this working when I could've used my uni laptop, but I'm not ready to give up just yet.
Can anybody help?
Was this page helpful?