Prior to the latest update I would occasionally have an item disappear only to find it in my family inventory. Nothing huge. Since the update I have now lost an entire room of paintings from my heir, plus the lights and furnishings, plus the windows placed on the pool that is the wall of that room. They did not appear in my inventory. I also had plants disappear from my garden, that did reappear after I traveled.
The newest part is having objects appear randomly. The latest was an entire harvest of fruit and vegetables, without ever having had a Sim harvesting, and an entire household of various furnishings. I would not have noticed this had I not been checking for my missing items.
I have tried traveling, removing various specified files, and my caches are always cleared each day before play. I do not use any cc or mods. I do use MOO extensively in my builds. Nothing else in the entire mansion disappeared, just this one, basement room. No other MOO objects were moved or missing, just the one room full.
I doubt I will ever get the missing items back but I hope there is a way to prevent it from happening in the future. Any solutions?