when you load a world then start up another minecraft and join the same world load the chunks and quit form the secon minecraft and after that you quit the firt minecraft when you open the world the chunks you loaded will be corrupted
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Thank you for your report!
We're actually already tracking this issue in MC-161823, so I've resolved and linked 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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