@hexadecimal, do you play with any Mods or CC🤔 They often become outdated when a patch to the game is released.
If you use Mods/CC please do the following:
1) Move the Mods Folder to your desktop
2) Delete localthumbcache.package file in the game folder.
3) Fix you game in Origin by logging in and go to Library, then right-click on The Sims 4 and choose the "Repair Game" option from the list. Wait until Origin finishes repairing all your packs and not just the base game.
4) Now, when you turn on your game again, it will create a new mods folder that will be empty. Check to see if your game is now working without mods/CC.
5) Now you can try adding back items from your Mods folder one at a time checking your game each time to see which item is causing your game to not work properly. If you have a lot of items, you can try the 50/50 Method.
The CC creators will usually update the CC items and Mods after these updates, so when you find out which one is the culprit, you can get the updated version from whoever made that item of CC in the first place. You should try these steps anytime you have problems in your game to rule out CC/Mods problems. It is the responsibility of the Mods/CC creators to update their items anytime EA releases a patch/update, and it is the responsibility of the people who use Mods/CC to make sure they are using the most recent version.
If you don't use Mods or CC , or if the above steps do not work, then it is probably a new bug. You will have to go to the Bug Reports section and see if anyone else has posted a bug report on this problem, click on the "Me Too" button at the end of the first poster's report and add you experience to the end of that thread. If they haven't filled one out yet, you will need to fill out a Bug Report yourself in order to bring it to the attention of the people who deal with the bugs in the game (as this section does not address that). https://answers.ea.com/t5/Bug-Reports/bd-p/The-Sims-4-Bugs But if you do use Mods or CC you will have to test that first, to rule it out before filling out a Bug Report. 😇
Updated to make correction in light of recent findings! 😉
This has been moved to the Bug Reports section and merged with the Bug Report on this problem. Please click the "Me Too" button at the bottom of the Original Poster's report !