This bug will cause player decreased favorability about the game.
When you joined the world that you saved your progress into your device, it shows nothing in your backpack or first item and your coordinates is different before you saved the progress (it can be recently two coordinates or spawnpoint).
Solution(currently) : Join the world again
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migrated
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We're tracking this issue in MCPE-164765, so this ticket is being resolved and linked as a duplicate.
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