I had a crown version of the Linchal Grand Manor that was predecorated, I personally added all mundus stones, 21 attuned crafting sets and a load of other stuff to it but somehow everything in the house was removed apart from the busts
Sorry to hear that, have you submitted a report ticket? That’s about all you can do, and maybe ZOS will respond here but they’ll still ask you to submit a ticket.
Its an issue with loading items (likely part of why caps are where they are). Happens in many games that some assets dont load or, with large world assets, distant assets dont load properly