Having a problem with diagonal walls after the update.

@Iamflare I am able to reproduce part of this but not all in my game. 

• I find that I can place wall decorations of several varieties plus shelves of several varieties on the walls of this diagonal room. Note: I did adjust the placement of the shelves via holding down alt and dragging them within the areas this method will allow:
  
  And in this case if you drop the walls, all items disappear:
  
  
  
  
• However, if I activate the MOO cheat and re-place three of the walls to locations that I was not allowed to freely place or place just using alt-drag without MOO...
  
  In this case if you drop the walls, all items disappear except the three shelves that I used MOO to place where the game did not allow:
  

So, this explains the items hanging in the air, but not why you are not able to place items on your wall at all without activating MOO. Can I please clarify a few things?

• Are you unable to place anything anywhere on the walls without MOO on, or can you just not place in the location you want to? Diagonal walls can be fidgety to deal with, and behave differently in several ways. Item placement can be tricky on them.
• Does this happen if you have MOO and all cheats off and draw a different room?
• Does this happen with cheats off and trying it in a different lot?
• Have you tried a game repair? [ Open Origin, click 'Game Library' then right-click Sims 4 > Repair Game ]
• If none of this seems to help, can you please upload the room to the gallery and add the exact name here along with your gallery name if it's different than your name here, so I can test in my game?