OS: Mint/Bazzite (Bazzite is extremely fresh, as in new install with all drivers yesterday)
Controller: Any lol (Xbox Series, DS4, 360, Gulikit)
Connection: USB (Many cables and ports tested)

Controller connects, is registered correctly with Steam, successfully test all inputs, third party online testing works, controller can work with Big Picture mode and with the overlay in game.

Despite all of this, when in games themselves, the controllers refuse to work.

Steam and most recent Steam Beta tested.

Have done the song and dance of global steam input settings and per game input settings.
It's almost as tho inputs are not being passed to the games themselves somehow.

Worked previously just fine. This started a couple of days ago.

Has anyone encountered this or have any clue as to how to fix it?
It's maddening tbh.