Houses/Lots Disappear

So this is happening to me as well, and it is consistent, I've backed up my saves, I go through updates and test without mods. It's not every world but it is several. In order to see it I guess there needs to be significant data in the saves themselves. I've repaired the game, I've reset the sims 4 folder, I've uninstalled and reinstalled. I've gone back to previous saves. Is the saving system not equipped to handle all that data? I've even done the scratch folder method, and nothing is working. Considering it's pretty pricey this is an insane thing to happen. I am so disappointed because I would have to start over. I have rebuilt all the worlds, except for the last two expansion packs. I've given all the townies makeovers. I hope there is a fix for this soon, I'm not sure if it's because I used backups but originally I just used the main save I was playing on I only went to a backup because of another bug I had to deal with that was fixed with a brand new install. So if the problem lays with using backup saves? That's also disheartening because it means a save file can become "corrupted" at any point in time in an arbitrary fashion.
P.S. All of my builds use in game items no CC.