Minecraft wiki entry for List_of_broken_features, associated text: Originally, taking damage would cause the camera to tilt towards the direction the damage came from. However, the direction value was not properly networked from the server to the client, causing the camera to always tilt left in multiplayer. As a result, when singleplayer was changed to use an internal server, the directional tilt broke there too. This was reported on the issue tracker and very controversially marked as "Won't Fix", though the (broken) code remains in the game to this day.