I started a new survival world in 20w11a and updated it to 20w12a, backed up and everything was normal for a few hours. After being away from keyboard on pause, my rendering has become sort of inverted. Leaving to main menu and returning does not fix the issue, nor does changing the smooth lighting. By restarting the minecraft application, it seem to disappear fortunately.

By the way this is a dynamic bug, I can never walk towards it, it just moves at a constant distance from me