DOOM (2016) via GOG not running on Heroic

When booting DOOM (2016) via Heroic (the recently released GOG version), it does not seem to work properly on Arch Linux (EndeavourOS to be exact).

The game stays on a black screen, seemingly taking over the cursor's visiblity. After a while, the OS says steam_app_0 is not functioning but even said window seems to freeze. It forces me to kill Heroic's process to stop the cursor visibility takeover.

Already tried skipping the intro cutscene via +com_skipIntroVideo 1 command line argument and switch between Proton Experimental and Proton 8.0 but that did not fix it either, sadly.
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