Basements will not create irremovable flooring between levels.
Fixed in Patch 1.55.105
I am playing on a Macbook (laptop mode) and the latest patch just dropped (UPDATE: 6/18/2019 – PC 1.52.100.1020 / Mac 1.52.100.1220) and now my house has a strange issue. Beneath my mansion is a giant underground Film Studio that I meticulously built. Due to the MASSIVE size of all the set pieces (you know real life green screens come in normal room sizes too, right?) the only way I could build a set on my lot, even a small fun one, was to build a multi-story basement at least 3 floors high. It was great when it was done, and i loved going into First Person to watch the long trek from main floor to the set, it was an adventure! But now the new patch dropped and I jumped into my game to make sure any mods (I pretty much only use the remove blur and a few outfits, nothing that really affects gameplay and no scripts) were still working, and discovered a problem with my giant underground studio. Every floor now has a dirt floor that I can't get rid of. My sims can still walk to the bottom, but they have to phase through three boring levels of Hell to get there now. I've tried to "delete floor" but the only option it gives me is to add floor, and even if I do that and delete it, the dirt just comes back. I just got back into sims when it was free recently, so I'm not even sure how to do half the stuff in the game still, so I have NO ideas on how to fix this on my own. When my sims are on the ground floor (especially in FPS mode) you can't see the dirt ceiling as it disappears, so once I'm actually in the studio it looks fine, but the dirt is really obnoxious making it so I can't see what's going on if I go up a level to interact with something. Obviously it has something to do with the patch and I've tried repairing game and no luck. Will honestly truck on dealing with it till I hear back because I don't know how to fix it and the studio was too hard to make to start over right now, so hopefully this can be fixed without having to rebuild or restart as it worked fine prior to the patch.
Quick update, I have completely rebuilt a new studio, going down an additional floor and building up, and trying many methods to add additional floors to see if any work, nadda. The dirt floor always forms past the initial basement floor, and all attempts to delete the floor just creates dirt again. Tried building patio floor, just floor, rooms, pre-built rooms, tried it all. Once I delete the floor...dirt. In fact I have new complaints about this as it also now affects build mode as I cannot see what I'm doing while placing things such as lights or other roof mounted items for the floor below. Again, once my sim is on the lowest floor, they can see the studio just fine, it's the trek down that's awful. And as i said before, this wasn't a problem till the patch.
