Ideas
I'm not sure if this would apply to your game - but I'll repost a reply I made to a similar thread:
The same thing happened with my game, I made sure my all my mods were updated - but I removed them prior to loading the game after the update. My played households would not load - but the unplayed households were fine. I did more research and found someone say if you use custom food cc, there may be a plate stuck somewhere on the lot that would prohibit the lot to load. So I put my mods back in the game - and it worked! I was able to load my households again. So if you use custom food cc - place them back in your mods folder and reload the game. Hopefully that will work.
This is exactly what was happening to me. Weirdly enough once I added my mods back, my game played fine lol.