I need ALL help I can get, my generation broke when update

Hi, I'm sorry to hear the many hours of playtime that risk being lost, but I'll try to give you some advise that may help you solve this. 
First I recommend you take a copy of your Saves-folder, before making any changes. It is good to have the original files in case the issue solves itself during a later update. 

I  found these two guides in the Sims 4 Helpers Blog:

Guide to endless loading 

Guide to loading error

They may be of help to you, keep us updated.
Good luck.

03e814d9e97d0e2a​ To get you the right support, please do these and let me know the results:

1. Rename Mods and delete localthumbcache
2. Start a new game. Can you load the new household into a lot?

If so, do these next:

1. Now load your regular save. Can you load a household you never played before?
2. Can you load your regular household?

Please answer these THREE questions, and I can get you to the right information.

I’m not sure exactly how it worked, but I tried again by placing my backup saves from before the update into the folder. I also turned mods back on (but not script mods), cause my saved really needed all that to load in. Also I deleted Better Pie Menu and Better Simology Panel, they caused IU problems.

This time, I finally managed to load into my main household, not just a new save. Better Exceptions has helped me sort out some mods, but it only shows one broken mod at a time, so it takes a while since I have to restart and let it scan all over again.

Still, I’m just really happy to have my families back, and so far I can actually load into them. The only problem now is that my Sims can’t interact with each other. I’ve updated my mods, but something is obv still broken, or the updates dont work either? Maybe Better Exceptions itself is causing the issue? At this point, I really don’t know. I have many mods. I read that mods like Healthcare Redux can cause this, so I removed it even though it was updated, but unfortunately that didn’t help. Do you have any idea? Or is my only option 50/50.

03e814d9e97d0e2a​ If you aren't getting interactions, please test if that's the case with no mods at all: Rename the mods folder, delete localthumbcache, and try again.

If it happens only with mods, check the mod download pages to make sure you have all the mods and packs those mods require. Many mods require a particular EP, for example; if you don't have that, all interactions might break (as one possible symptom). Other mods require a "core" or "injector" type mod, which might or might not be by the same creator. 

Normally I'd offer to look at your whole mod set, but unfortunately, I can't do that today, and tomorrow is only slightly possible. However, if the advice above doesn't help, at the end of How to Use Mods and CC are instructions on how to make a file for me to use. 

I did dig through my mods and managed to find what was causing the original issue. Since then, the game has actually been running much smoother and interactions work normally again. But now that one problem is gone, a new one has appeared.

The game no longer saves properly. If I save five times during gameplay, maybe only one or two of those saves actually work. The most recent save almost always ends up corrupted — when I restart the game, my main family is completely gone. I need to repair to a back up. That means I keep losing up to an hour of gameplay progress every time I restart. Can't seem to find anyone who had this issue.

03e814d9e97d0e2a​ Does the game save properly without mods?

Without mods, I couldn’t even get into that household. I decided to save everything important and move everything into a new save file for the first time ever. I think the old one was made in like 2023, is just so corrupt at this point I guess. 

 So far, so good! Happy I could save everything and I rebuild the family tree with mccc.

03e814d9e97d0e2a​ When you remove mods, that can block household loading (because of food mods and playmats, mostly). Test with a new household.