[OPEN] Round rooms have blue ceilings/ceilings don't get painted properly

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? 1.99.264.1030
What expansions, game packs, and stuff packs do you have installed? All packs.
Steps: How can we find the bug ourselves? Attempt to edit a ceiling in a rounded room.
What happens when the bug occurs? Parts of the ceiling are missing on both sides. It's not possible to edit the full ceiling, even after removing and re-adding it.
What do you expect to see? I expect the ceiling to work correctly.
Have you installed any customization with the game, e.g. Custom Content or Mods? Never used.
Did this issue appear after a specific patch or change you made to your system? Neutral/Not Sure 

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I'm editing a lot where one of the buildings is rounded. The ceiling has blue patches on it when seen from below. When I try to edit the ceiling, parts of it are also missing, making it impossible to edit it completely. Removing and re-adding the ceiling to the room, or even scrapping and rebuilding the room from scratch, has the same results.