[BY DESIGN] Sim's Paintings/Photos Tagged As Custom Content

Product: The Sims 4
Platform:Mac
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? 1.71.86.1220
What expansions, game packs, and stuff packs do you have installed? City Living, Get Together, Island Living, Snowy Escape, Cats & Dogs, Jungle Adventure, Spa Day, Vampires, Cool Kitchen Stuff, Fitness Stuff, Moschino Stuff, Paranormal Stuff, Perfect Patio Stuff, Tiny Living Stuff
Steps: How can we find the bug ourselves? Take a photo or paint something (in game, not photos of custom content) and try to save the lot; it gets marked as CC.
What happens when the bug occurs? I try to take a photo or paint from reference something that is in-game. When I place it on my lot it gets marked as CC. Only ONCE I was able to take photos on a fully empty lot, save it to my gallery as a room and it wasn't marked as modded. As soon as I place that room on a lot with a build I'm working on (that isn't previously marked as modded) it gets the mark.
What do you expect to see? I would expect if I take photos of in-game assets and try to place them on my lot that it wouldn't get marked as custom content.
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? No

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Unmodded room:

Lot, not marked as modded:

Lot NOW marked as modded, after ONLY adding room from gallery marked as unmodded: