San myshuno palace disappeared, another house fornitures float on the palace lot

Hi! I'm having this issue from last month: I was furnishing the Cullpepper residence in San Myshuno and later I try to open the Alto's appartment and the palace disappeared (is still there in the map) there is only grass where I can build on, but the strange thing is that the fornitures of the Cullpepper house are there, floating in the air, and can't be deleted. The problem shows up either in build/live mode. The cullpepper house and the others in San Myshuno are completely fine. I try to open the same palace in my other saves and they are completely fine, so I assume it's a problem of this save only. I tried remove my CC and mods, but with all of them all worked fine in the past and I didn't get new one in years. The problem stay the same with and withouts mods/CC. 

Can you help me with that? Do you know how can I fix this?