This is a paper about a (thankfully) hypothetical young woman who has identified as non binary since the age of 5 and began puberty blockers at 11. At 18, she has decided she wants to stay on them to reflect her non binary identity. The authors argue that she has capacity to make that decision despite the fact that her brain will not have fully developed, because we don't actually know for certain that there will be harm as the studies haven't been done. And besides, her psychological well being of being kept in a state of perpetual prepubescence is more important.
https://jme.bmj.com/content/46/11/743
Just who will benefit from adult women who look and think like children? It's certainly a bit of a mystery 