Game Play Issue: Unable to get house’s back (that I built)

Hello, recently I got a new wifi (an upgrade) afterwards I launched the Sims 4 and realized it wasn’t working. At the time I didn’t realize it was because I hadn’t connected the wifi to the console, however now that I have when I launch the sims it only kept data from a couple of my worlds and deleted my houses that I’ve built but the weird thing is there are only a couple of worlds that have deleted my house data. And it’s not just base game worlds that kept their data, there are other worlds that I have bought (via packs) and they have houses I’ve built still in them. I have some houses that i downloaded and are in my library but mostly the ones that have gone missing were never saved. Just a side note: All the family’s are fine it’s just the houses. Please if anyone has ever heard of this or has had it happen to them, it would be so helpful to hear what you did to get them back. Thanks so much for taking the time to read this.