This issue was found on official dedicated server. Not an occasional event.
When a player moves from nether to overworld, the progress he made in nether (including building and store stuff in a chest) cannot be saved. Items can be duplicated through this glitch.
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Might be caused by MC-214898/related issues

Relates to MC-63
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We're tracking this issue in MC-216148, so this ticket is being resolved and linked as a duplicate.
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