Same here, actually - no sound. I don't even see the application in pavucontrol; even though the game sees my devices, it doesn't claim them?
I'm using pipewire for audio so passing `-sdlaudiodriver pipewire` to the game fixed it for me.
Thank you, that worked! Happy fragging :)
edit: If anyone notices laggy audio, try going to the audio settings and switching devices from 'auto' to the one you want
Have you tried gamescope out, perhaps the '--immediate-flips' argument? That suggests it may lead to/allow tearing - or does it depend on what you're waiting for?