Alriht, I received an answer. There haven’t been any changes to joystick functionality, so it does at least look like an OS issue. You could of course provide a link to your game profile here, so we can check it for anything unusual.
From my experience, joystick mapping can get screwed up sometimes. My gameped, a GameSir G4s, can be paired in 4 different modes, and each one behaves differently. I also get weird button misconfiguration in SNES9x EX and some other emulators when I connect via bluetooth instead of USB cable. That messes up my L1/R2 and L2/R2 buttons, for example.