When playing on a old world type you can save the game by "Save and Quit" but autosave doesn't work. Example when a crash happens you lose all progress. I don't know the exact reason but it mostly happens while switching slot to inventory slot that has a map that has been zoomed out so you can see outside of the world on the map. (I'm note sure if doing this while sprinting will cause this bug, but mostly it will)
Device: Galaxy J7 Prime G610F