I upgraded my survival world from 1.12 to 1.13-pre1 after creating a backup. When I opened the chests in my survival world, the items in some of the chests were in the wrong order. The top 3 rows and the bottom 3 rows had switched places. This did not occur in all of the chests, but roughly in half of them.
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However, this issue has been closed as a Duplicate of MC-122625.
It has been linked to this report. If you have additional information, please add it to the duplicated report.
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