Re: Base Game Worlds and Wall/Roof Patterns Missing

Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Every time (100%)
What is your current game version number? 1.63.136.1010
What expansions, game packs, and stuff packs do you have installed? All expansion packs except Get Together and Eco Lifestyle. I have Parenthood, Dine Out and Outdoor Retreat installed for game packs. Laundry Day and Tiny Living are the only stuff packs I have installed. I do not have either of the free packs installed.
Steps: How can we find the bug ourselves? On the Main Menu page, there are a bunch of llamas over a few of the packs I do not have installed, but none that I currently have installed. When I go to into build mode and CAS, there are llamas over the pack pictures and some clothes and items have question marks over them/replacing them. I will include screenshots from my game below.
What happens when the bug occurs? Llamas are over a lot of the pack images and questions marks appear in place of actual furniture and flooring, walls, etc. Also, pre-placed furniture from pre-built homes had really weird shadows underneath them that didn't match where the furniture actually was.
What do you expect to see? Just llamas over a few of the packs on the Main Menu screen, in CAS and in Build Mode. There is also question marks (?) all over the floors from packs with llamas over them, etc. Some of the trees and such also have question marks displayed where they should be. I tried going to Willow Creek as everything in there is from the base game, and to see if there was an issue with the packs I have installed. When I did this, the same thing happened, questions marks were over trees, replacing walls and weird shadows appeared under furniture.
Have you installed any customization with the game, e.g. Custom Content or Mods? Not now. I've removed them.
Did this issue appear after a specific patch or change you made to your system? Neutral/Not Sure 

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As well as the issues above, the llamas appear on the "choose your world" screen and in the actual worlds there are random squares where neighbourhood logos should be. I'm really confused as to why this is happening and hope this can be resolved soon. I just returned to the game after a few weeks of taking a break and found this. Your support in helping me fix this issue is much appreciated!

Thank you so much,

Lindsey