The worst that could happen is that instead of having a ~5% chance of having angst because of their gender identity, they have a ~95% chance because they were missing the gender feedback they needed (that 95%+ of people now get and seem fine with). I think this is extremely unlikely because children tend to be very adaptable and thus most would likely would be fine either way, but as long as we're speculating, the upper limit for how bad it could possibly be is really high.