Yes. I did open another family. That must have been what fixed it.
I had the same issue. Quite terrifying right before the new pack coming out. I moved the household out, saved the lot to the gallery, saved the family to the gallery, deleted the old family and the old lot, created a new family with the save file and placed the lot back from the gallery. Moved the new household into the new lot and it worked. Now did a very fast save from my files to backup, one minute to go until the new pack (Eco Lifestyle).
I’m actually experiencing this now, and I’ve literally got so far on this save I want to cry
this image is abit better
