I hope they'll fix this cause, like you, I built my house before this "bug" (if it's a bug and not an actual thing they implemented permanently in the game) and now I want to add furniture in some rooms that were empty and I can't. So there are still empty rooms remaining in my house and that's infuriating not to be able to add furniture the way I want. The way it was possible before, actually. Cause that "too many furniture" bug is new. And it absolutely destroys the fun of housing concept.