I downloaded a house from the sims gallery and am having the same issue with the bottom most floor.
Hoping to bump and find a fix
I fixed it on ps4 maybe itll help you on pc?
pools and fountians in basement area (or above b-area) cause it on ps4- i fixed it using the basement tool (not custom basement tool) to draw each line of the room out creating a empty pocket. Also as i was trying to paint the walls and drag them the pool showed up in red outline.
@justwant2respond Great detective work! I have also found that some aspects of basement building and editing can be temperamental &/or require a variation in methods and results. I will typically experiment with what method of adding something that it will accept, and make sure you are always continually checking the floor(s) above when adding basement rooms to make sure none of your experiments effected the floor above. Always do this before saving again so if your actions did effect the floor(s)/content above you can just exit the game without saving and all is forgiven. 😉 It's a good way to learn new things about building, also.
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