I haven't found this issue anywhere, so I'm posting it.
I'm playing on forge 1.19 41.1.0, with minecraft comes alive 7.3.14 and architectury api 5.10.33. I found this weird, that either me or my sister (when we play together) can't marry a male villager. For a test, on singleplayer I created world with two males and two females. All of them have 100 hearts with me. I gave the rose gold ring to all of them - both males pulled me off, and females accepted my engagement.
Males says something like "It's not you, it's me! Or... maybe it's us..." or "I'm sorry, but i just don't think we are right for each other", and females "Is it serious? This moment, not ring. Because ring is true?" or "Yes! I'll marry you! I love you!"

(I'm playing on polish so I don't know if the translated conversations are perfectly right)
It's the same when I choose the feminine or masculine. I can marry male and female npcs without any issue, it's just the player.
Does someone know how to solve this issue? I don't want to my soon-husband to be my "wife" in ceremony :D

Test case verified, closed as intended. You can change you gender via the editor command or the destiny screen.

The villager needs the bisexual trait for marrying the same gender npc. By default, the destiny screen when you first started the game sets the gender as Masculine/Male, so this could perhaps be the issue, and explain why both males said no, while the two female npc's accepted.

Unfortunately this don't work. As I said, I tested both feminine and masculine. The problem is with both genders. Bisexual traits works, but I feel a little weird, when I try to hug or kiss my mate while having female gender, and always get rejected after removing bisexual trait. When I used the 7.1.0 version this problem didn't existed, everything was okay. Only on this version I have problem don't know why - if I'm female, they reject me, if male - too.

Resolved in 7.3.15, seemingly caused from a faulty gender check for Players.

Reopen if still present after 7.3.15