i was playing survival and i noticed a chunk error that wasn't going away even as i got closer and tried to walk on it i also saw a sheep falling down in it so i saved and quit and found a multiplication glitch. screen shots added chunk error on the right. then i tried to save and quit again and when i tried to log back in it would not let me it stays at the loading screen for a while(screen shot) and then clicks back to the world selection screen. i ended up having to delete my game.