No slots on treehouse

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? 1.97.42.1030
What expansions, game packs, and stuff packs do you have installed? Growing together, high school years, cottage living, discover university, seasons, cats & dogs, get to work, my wedding stories, parenthood, nifty knitting, toddler, backyard, kids room, desert luxe, little campers.
Steps: How can we find the bug ourselves? Try to place items on the treehouse deck.
What happens when the bug occurs? I cannot place items.
What do you expect to see? Items of proper type and size should be placeable on the treehouse.
Have you installed any customization with the game, e.g. Custom Content or Mods? Yes
Did this issue appear after a specific patch or change you made to your system? Neutral/Not Sure 

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I am trying to place some things on my treehouse, but nothing will slot to it, including things I know are supposed to. I have no mods, only cc. And there is no cc on this particular lot.