I just discovered an issue that when an old world desen't save. When you quit the game (not by pressing the "Save and Quit" Button) and leave, Your terrain that you built disappears.
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Avoma
Duplicate of MCPE-98789.
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The game saves incrementally, it does not autosave world by crash exit of game (not using save and quit). If you do not wish to lose progress when exiting game, use save and quit, then close out game properly (not force crash using device app closing, but closing the app with built in function, only exception is PS4/5 after saving and quitting world).