Recently purchased a Month-long Minecraft Realm and used it with one other person. Have accessed and played on the realm a few times, however between uses no progress is saved. The only saved data is from one of the first uses of the realm. Multiple times all progress was deleted or unsaved on this realm, each time returning to the same point.
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Thank you for your report!
We're tracking this issue in MC-252921, so this ticket is being resolved and linked as a duplicate.
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