With this in mind and before we try other things since you had mods or cc before there is a possibility that there could be remaining effects.
Sims 4 roof trim glitch.
Songofawesome i have tried adding roofing sections of two types on three different floors and added the both of the version of the roof trim and cannot reproduce the issue these tests also included medium and regular wall height floors.
If i move the roof that was on the room i just deleted down to be on top of the middle 2nd floor room the shadow appears against that roof section.
Sections of roof trim will just be black.
If i add a roof to the front room it makes no difference.
The trim i ve used and seen it happen on is the fine thatch roof trim.
Also adjusting the the height of these roofs does not seem to effect whether the shadow is there.
I have a screen i will post when i get a chance.
The room or custom room tools.
This is happening on ps4 also with 1 20.
Although the sims 4 has made building houses better than ever it s still a bit tricky to make your dream home.
It commonly occurs when people use fencing or half walls in the interior that connect with an exterior wall it can also happen when building with manual walls vs.
We can alter this however by grabbing the bow tool which appears as a ball when we select a roof piece.
Here are a few tips to help you graduate beyond just making a box with windows.
2 22 2020 here s a screenshot of my house having this issue on the current patch.