Mojang Twitter support advised this is a bug and to post here. I run a bedrock realm where we've been experiencing mass chunk edits, suddenly erased inventory, and a mysterious player who was not invited on an invite only realm. The only thing I know about the mysterious player is that they appear as "cookie", but the players who witnessed them the one time did not capture the full gamertag. Since then, we've experienced cleared inventories and chunk edits but no additional player. Can anyone offer info on what is happening and how to mitigate? Bedrock notoriously has zero logs or control over this sort of thing... thanks in advance!