After exiting and saving the world, my game has been stuck on the saving screen (the one saying "Your game is being saved. Please do not turn off your device") for close to an hour. All I can do is access the Xbox menu, no other buttons are doing anything. Whether the game has saved or not I can't say without completely closing and re-opening the game.

EDIT: I closed and re-opened the game and reloaded the world and it has in fact saved.