When an observer observes the contents of a container like a chest or barrel, It thinks any amount of inventory is a change when you first log in, appearing as if the container changed even if the contents are identical as when you logged out.
...DFBO.jpeg is before relog, ...3554.jpeg is just after relog.
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Thank you for your report!
We're actually already tracking this issue at MCPE-29548, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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