I believe it's a change that came in with patch 6, so quite recent, but adding onto that, I'd like to point out that this game has had issues with it's romance flags from launch.
There was a period of time where Gale, Halsin, and Wyll's flags were broken all at once. Wyll had the issue where he would provide his dance scene without having been flirted with, leaving people feeling upset and confused because they had to harshly reject him for no reason. Then there was Gale, and people having break up with Gale multiple times in order to do anything with anyone else, because the game would not unflag his romance, so every romantic action with someone else prompted yet another upset conversation with Gale. Same with Halsin, his romance flags were being tripped even when people didn't flirt with him at all, leading to awkward scenes and the issue where he was handing out kisses before the last battle completely unprompted.
I personally found an issue with Minthara's romance where the game actually would not play her romantic scene at all, and i discovered it had something to do with her and Astarion's flags being confused somehow. Ignoring Astarion completely was the only way i could get her scene to play. I didn't continue with her romance in that run, so i don't know if her romance has any other issues.
It's good that these things are getting fixed, I just wish they were fixing it faster.
