Not really. They might be "I want to be a man but I like men" (a fair number of real life FtM TS are like that) or "I like women but I want to remain female." I don't think the church cares too much as long as the gender ratio doesn't go too much beyond 50/50 so that reproduction doesn't become too problematic (though they probably do skew things by saying "half of people should do each" and let most girls take that to mean "one of us should become a man").
Remaining girls is another issue entirely. Even though I think they all wish they could.