Why do certain KEYWORDS keep declining despite already being included in your database?

I've tried twice now to include the tag 'lesbian-couple' onto a movie centered around the relationship between a lesbian couple in a horror movie.  Both times rejected.  The tag 'lesbian-couple' is used on 951 other titles (including the TV show Friends oddly and even a children's cartoon).  So why is it being rejected for the movie "BITE" (2022)?

Despite it being an actual plot detail (which was declined) I tried using "other" (but was also declined).  I also tried to include a tag to alert others to the subject of 'incest' being apart of the movie as well (given the bad guys are brothers/sons with their father/brother who all share the same mother) but that was also declined (despite variations of it being tagged to roughly 8,000-10,000 titles here). 

I've been actively trying to include only relevant keywords to recent movies I've seen in an effort to make them easier to find (search or Google) if someone doesn't know the title.  A frustration I know all too well.  However, why these keywords (though appropriately applied and already included in the database) are repeatedly declined, I don't understand.  Is there a reason why I'm just not seeing?

BITE:  https://www.imdb.com/title/tt7575142/