We were playing 4 player local play in a world we have spent countless hours in. All of a sudden the world exited out and went back to the minecraft home screen. We launched the world again and only the player who owned the world currently has all their inventory, hotbar, and end chest. All the other 3 players were reset to the spawn points with a map like the start of a new world. All the builds and work done by the 3 players are still their, but all the inventory and end chest is gone.