When playing Minecraft Dungeons in (offline) multiplayer, my account's saved data (it is usually just one save) or someone else's is completely wiped or moved to someone else's account for an unknown reason. This has happened when playing with no WiFi (when the PS4 cannot or is not connected to Playstation Network) and when a device connects via remote play, but could be for other reasons too. This has not happened every time, but most of the time.