[FIXED] Romantic interest for everyone in group conversations (flirtatious joke)

Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Occasionally (10% - 49%)
What is your current game version number? n/a
What expansions, game packs, and stuff packs do you have installed? Everything except Spooky Stuff, Romantic Gardens, Jungle Adventure, and My First Pet Stuff
Steps: How can we find the bug ourselves? Have a sim flirt/use romantic interactions with their significant other while in a group conversation.
What happens when the bug occurs? Everyone in the group gets the pink romantic interest bar as if you flirted with all of them individually.
What do you expect to see? Only the Sim who was targeted gets the romantic attraction bar. Everyone else will be indifferent.
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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Basically the problem seems to be that if you use a group conversation, everyone in the group will react to something you're doing to one person specifically... which makes sense for things like jokes and insults, but is really disruptive and annoying if you use a romantic interaction because suddenly everyone has become your "romantic interest". If you try cutting off the romantic-ness by using the "Ask to Just Be Friends" option, the target will get super offended and throw a tantrum... even if you barely know them. And even still, they show up in the phone book under "Romantic Interest" with a little blurb in the description that implies your sim was ever interested in them to begin with.

I originally had this bug occur in a completely vanilla game about a week ago, and then I installed MCCC and had the same thing happen. I then tested it in a brand new mod-free save, and noticed that it was still happening but really hard to trigger intentionally, it seems to be completely random when it will occur. Still, the general issue happened-- if I used romantic interactions between my two married Sims while another person was involved in the conversation, the other person will react as though you're using it on them. If you are friends or higher with them, they tend to get the romantic interest bar, random strangers who are not in a flirty mood will just have the "Awkward Conversation" thing. Strangely, when I had the bug happen in a conversation with four sims (two couples), the uninvolved couple didn't seem to experience jealousy/anger despite somehow having another person flirt with their spouse.

Aside from MCCC, which I installed after I encountered the bug to begin with, I don't use any mods or cc. I have tested without and the issue still occurs, but is very difficult to just force. 90% of the time, if you flirt with another sim while a group conversation is going on, it won't affect anyone but the target sim. It's just that the 10% is really bad and there's no way to completely nuke the romantic interest bar altogether or move them out of that section of your phonebook.