I think the mangaka just rolled up to an okama bar, had some fun, and said "damn I now know what the Transgender Experience™ is, lemme do a quick manga". A pity, because done properly we could have had a cool exploration of sexuality and gender with both Itsuki and Hina, but as it is it just seems confused at all times.
It's weird how sometimes there were parts where they seemed to get it though?? Like the chats on the bar with Maru (I think that was her name?) and the wedding part, but it would just return to the usual mid affair. As said, a pity, wish it was better.