Platforms make rooms separate from house

@Elithian87  Hmmm... If your room is set up anything like @FalconSims 's in those screenshots, I think I may have a clue what the difference is between this and my test on my lot. My platform areas were all within the room and not touching any orf the room's outer walls.

When I dragged the platform area to intersect with the wall it deleted the wall. I had to then re-draw the wall, and the room no longer recognized that new wall section as part fo the rooms exterior wall (when you click an exterior wall it does not highlight that wall section:

So, in that case if I saved that room to my library, upon placement of the room the platform area and wall piece are deleted:

Plus, as in the case of the other test, the ceilings are deleted when the room is placed:

I could see parts of this dynamics as possible oversights and a bug, because this will not allow a save any room with a platform against the wall if this happens with all types of platforms that are against a wall. I don't see any reason why it would be by design/intended for the ceilings to delete when the room is placed either.

This reminds me of making a 'sunken room' area previously - that we needed to make sure there was at least one tile between the sunken area (deleted floor combined with foundation) and the wall to get it to save with the lot, though it wouldn't save with the room by itself. But even then I don't remember the ceiling deleting. Now the sunken platform area will save with the room, but not if it touches the room's exterior wall, it seems?

Edit: I tested and the same thing happens with the wall, saving the room to the library and placing with a raised platform.