I quite commonly find posts in which a subject of ambiguous gender is tagged with multiple gender tags at once. Most recently, I saw a post of a solo feral character with a vagina and (typical of ferals) an androgynous body shape tagged with both female and andromorph.
Whenever I've seen such posts, I've "fixed" the tags by settling on a single gender, but considering how often I'm seeing this, I'm starting to wonder if I'm the one who's mistaken.
Is there some obscure consensus that characters disqualified fron the ambiguous_gender tag that could be interpreted as more than one gender be tagged as multiple genders?