I can confirm the front door bug. Below you can see when a door is placed on floor two as an example. Then you can see another home with no problems at all because the door is on the first floor. Many of my lots are ruined now with this particular bug. I tried removing walls, windows, even removing the doors entirely. It will not allow me to select a different door to place as the front door if the one I want as a front door is on floor 2 or higher. Currently for me it is only working properly if the door is on the bottom level of the home only. Wasn't sure what was going on so searched and this post came up. I do not know what broke in the game this time to cause front doors to break in this manner. I can only hope that the devs fix this issue at some point. Last patch had no fixes for it. Perhaps they don't know what is causing it either. Thank you for posting it so what if more people are having this issue, they can see it's just a bug.
EDIT- First photo shows floor 2 for the entry. Second photo shows floor one for the entry which has no issues. The first picture on floor two is the problematic one on every lot I have of this type currently.
