Build Mode Broken on Uninhabited Lots

Technical Info:

Computer Info: PC, Windows 10

Game Info:

• Version 1.80.69.1030
• Playing in windowed mode
• Using mods (objects, CAS items, WW, Twisted Mexi BetterBuildBuy).
• Expansion Packs owned: Cottage Living, Snowy Escape, Island Living, Seasons, Cats & Dogs, City Living, Get Together
• Game Packs owned: Dream Home Decorator, Parenthood, Dine Out, Spa Day
• Stuff Packs: Tiny Living, Moschino, Fitness, Vintage Glamour, Perfect Patio
• Kits: Courtyard Oasis 

Let me know if I should add any additional info!

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The Issue: Build Mode Broken on Uninhabited Lots

I first noticed this issue about a week or two ago (between Sep 16 2021 - Sep 23 2021). I was playing a family in Brindleton Bay, and build mode was working perfectly. On a whim I decided to check out the empty residential lot next door, to play around with building it. After loading the lot, I noticed several things were missing in the UI (the entire bottom panel, mainly.) Also, all button interaction stopped working. I could click on the newly redesigned Gallery Button (with the lightbulb), but it didn't load anything. I tried opening the menu to exit- also nothing. It didn't load whether I tried clicking on the menu button or hitting the ESC hotkey.

Today, I wanted to add a new rental lot to an empty lot in the Sulani neighborhood. From the neighborhood view, I opened up The Gallery, which loaded and worked fine. I found and saved a few lots to my library. Then I chose one, and selected the option to place the lot in my 'hood. The "Building Lot" load screen came up.... and never finished loading. I force quit the game, tried the same steps again, and it just kept loading and loading for several minutes. I force quit the game again, and this time I went into the empty lot first, to try placing the Gallery downloaded lot from there. However, I found it had the same frozen/missing UI issue like when I tried to edit the Brindleton Bay house. Almost all buttons were non-responsive (the wall up/walls down button works), and the main editing menu on the lower half of the screen was missing.

See screenshot attached.

Troubleshooting I have tried so far (that haven't worked):

• Repairing my game from Origin
• Deleting Origin and Sims 4 cache files

Not sure what else it may be... mods, maybe? Has anyone else experienced this problem recently?

Other than these specific cases, the rest of the game runs as well as it always has with my current setup, and build mode seems to work fine if it's an inhabited lot.