

WOW, yes, your problem is almost certainly Flatpak-related. I’m surprised you even got as far as you did. Flatpak is often great but does not tend to play well with applications that need less common capabilities.
I’d recommend installing VMM in a different way if that’s an option for you; I expect that will likely make your problem go away.
Nah, that’s valid. I loved it to bits, myself, but what made me love it was how adroitly I felt it curated feelings of dread and sincere awe as I explored deeper and deeper; and that’s highly subjective. I hope you’re finding as much joy in your own fave games as I did in Subnautica!