@CGrant56 Yeah so I just renamed my folder so when I loaded the game it created a clean Sims 4 folder and tried again now on Sporting Space (we movin~) and the issue still persisted so it does appear on pure vanilla versions of the game.
ALSO, I was just typing that ^^ as you added the edit, we're in sync. I just tried what you did in the edit too and the same results. I've also tried this in Willow Creek to see if it was an issue on other worlds besides Brindleton Bay, and changed the order of how I did things and no matter what, it still came back.
I did notice something when I was trying it in Hallow Slough, after I removed the floor of the upper level, it stops seeing it as a room. I think that may be it. I accidentally clicked on one of the outer walls and noticed it didn't highlight the whole room and I was able to delete the wall. Here's a video of that. I think I found the issue~
I went back again and looked to see if I could reproduce what you did. I couldn't. No problem with selecting the space without the floor as a room. Only thing was that I couldn't put a floor back in without adding the ceiling back below and that brought the dirt floor back.
My test build still sees the open space as a room. The entire space gets highlighted normally.
Tried something else too. Since you can't delete a single section of a basement's perimeter walls without deleting the whole thing, I built a one tile wide room all the way around the basement by building rooms outside of each perimeter and deleting the intersection walls so it made those 4 separate rooms into a single one tile wide room, sort of a box within a box type of thing. Then I tried breaking the original perimeter walls and redrawing them. Dirt floor appeared immediately when I did that.
This is very much like what happens in apartments as you cannot change the exterior walls in them other than by painting on the inside. The perimeter walls are fixed and can't be altered. Basement perimeter walls work pretty much the same way so I wonder if there is a connection. There are a number of posts here that can give you an idea of the problems that has created as all kinds of problems editing apartments in build have been reported including not being able to place floor tiles, change interior walls or even place rooms from the Gallery. I see a lot of similarities with this issue from testing a number of them along the way. None are quite the same though.
Hope this helps.
