When going fullscreen, character looks up into the sky and spins around quickly.

While playing single player in a survival world, pressing Fn + F11 (the key combo to put you into fullscreen), while the game is unpaused will cause your character to look up into the sky and spin around. Fixed by pausing the game. Issue remains if you don't pause the game and then go back to windowed view. Any user input except pressing Esc will not stop the bug.