Once again, as said, many, mnay, many times now....
Playersexual =/= Bisexual
Bisexual =/= Playersexual
Not the same thing. Different things. Very different things. Completely different things. Virtually unrelated things, except in as far as they are both within the sphere of talking about an individual NPC's intimate preferences.
I really wish, wish, wish, that people would stop conflating the two.
So far, as defined by the story we have, in BG3, there are exactly ZERO companions that are canonically defined as bisexual. None. Not One. Not A Single One.
Not sure what you are talking about, maybe we are not playing the same BG3...
They are ALL bisexual at the moment.