this is a feature not a bug
yeah i know, this gives gives you two accounts in one as a guest when you log out and then in again as guest sometimes you lose your stuff but this can happen again and can switch inventories/ accounts when logging in as guest
this does happen but not always, ive seen this in some youtubers videos and it dosent always happen it might be random
does it lead you to pre-update aquatic chunks that were already loaded, cause if it does, thats your own problem
i dont even understand how this could happen in the first place, only items should be deleted in the void any entitys should slowly die just like the player