Please help - frieze in interiors bug!

Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Every time (100%)
What is your current game version number? 1.46.18.1020
What expansions, game packs, and stuff packs do you have installed? Seasons, Cats and Dogs, Parenthood, Vampires, My First Pet Stuff, Spooky Stuff.
Steps: How can we find the bug ourselves? Create a split-level room, place frieze on the exterior walls of the room, and then delete a small section of the fence or wall that you used to create the split level.
What happens when the bug occurs? Frieze appears inside the house.
What do you expect to see? Frieze applying on the outside of the house as normal.
Have you installed any customization with the game, e.g. Custom Content or Mods? Not now. I've removed them.
Did this issue appear after a specific patch or change you made to your system? Neutral/Not Sure 

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People, I am at my wits end with the frieze-showing-up-in-interiors bug. This bug seems to occur because the game does not recognize the empty space in a split-level room as a room in its own right, which may be how the game was built, but it is incredibly prohibitive for certain builds and ruining my enjoyment of the game. I have some pictures of what I’m trying to do with my current build. Maybe somebody can suggest some other way to achieve it?

First I’ll show you the traditional split-level room and how I have previously worked around the bug using a fence to divide the room:

In the two pics above, I first divide the second floor with a wall, which allows me to eventually remove the floor in one of the rooms to create a landing. Next, I replace the wall with a fence.

Now I have a nice loft onto which I can easily place stairs without breaking the divide between the two “rooms”; this is because the top stair landing can be placed THROUGH the fence and the game will create a space and still recognize that a divide is there.  This is important, because it means I can place frieze around the outside wall without the game becoming confused and not recognizing the open space as a room.

The frieze works! Yay! Now on to where I run into problems. I want to create stairs that lead DOWN to the landing so that the landing emerges where the fence is.

As you can see in the first pic, I have to get rid of a section of fence so that the stair landing can go through it. This is a problem because, once the stairs are placed, I cannot place a fence across the bottom of the stairs to create separate rooms, as shown in the second pic. The result when I place the frieze and then delete the floor to create the landing?

At first, the frieze stays put, but if I leave my lot to visit another world and come back, or if I place another room, fence, or stairs, the frieze pops onto the inside walls and looks ridiculous, especially with the bulkier friezes and the holiday lights from Seasons (this is the reason why I want a frieze on my build in the first place, to have the pretty lights on it).

And there it is. I have experimented for hours and there is absolutely no way to fix this. You can redraw the room, replace the frieze using the shift key, and though at times it may seem like it will stay put, once you change anything or travel away from the lot, there the pesky frieze is again.

Now, I don’t know much about game development, but it seems like this would be an easy fix if it was made so that we can place the bottom stair landing THROUGH fences like we can with the top stair landing.

Potential future fix aside, does anyone have any other tricks I can try to get this working? Am I missing something? It’s frustrating me soooo much.

Thanks!