I have this issue and i've realized I am not the only one experiencing it. It really bugs me because it started to happen more frequently where the minecarts and villagers start disappearing I was telling myself it's impossible my world corrupts the chunk that much. I've grown tired of it because it happens too frequently and my simulation chunk is naturally at 12 chunks and for my minecarts it keeps disappearing out of the blue I dunno what more to say and it happens. Plus we live in a undergroud bunker and the villagers are imprisoned in a box where they can't go anywhere. They're disappear and I have enough light source I don't know if that would change anything and it happened to 2 of them my farmer and armourer and now I don't want this to happen to my Mending Librarian cause I'd get impatient to play in the world so if this is a known issue please elaborate the solution if there's one and if not please fix this