Logging into an existing world clears inventory and ender chest, and starts the player at spawn as though they were a new player. Any items in the player's inventory or ender chest are lost.
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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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Exiting out of world and rejoining returned missing items. Bug may be related to player logging out while riding a trader llama.