I have lost multiple long 8+hr play sessions due to realms continuously rolling back multiple hours at a time as soon as everyone logs off. Very annoying, happened last time I had a realm and they updated to the new version, but this one has persisted for much longer than last time.
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We're tracking this issue in MC-252921, so this ticket is being resolved and linked as a duplicate.
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Having the exact same issue with my realm, just tested it again two, played for about 45 min, got off for 10 minutes, and it reverted me back to before those 45 min were played.