[FIXED] Glass roof/Windows over basement won't display basement

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? 1.67.45.1020
What expansions, game packs, and stuff packs do you have installed? Eco Lifestyle Discover University Cats & Dogs Seasons City Living Outdoor Retreat Tiny Living Holiday Celebration
Steps: How can we find the bug ourselves? Build a home with an open-air basement space, windows, and then an interior basement space with walls. Look through the windows into the basement space while the ground floor is selected.
What happens when the bug occurs? The walls inside the basement disappear when viewed through windows.
What do you expect to see? I expect the walls to appear, as they do when viewing through the window with the basement floor selected.
Have you installed any customization with the game, e.g. Custom Content or Mods? Yes
Did this issue appear after a specific patch or change you made to your system? Neutral/Not Sure 

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Most of the walls inside the basement fail to render when viewed through windows. The example screenshot has a lot of CC and some mods, but the same issue occurs if I disable CC and mods.

What I see from the ground floor:

What I see from the basement level: