Also quite honestly, if kids are detransitioning- so what? Honestly, good for them.
Nobody is doing surgery on trans kids. Nobody is doing anything more than MAYBE puberty blockers (which are clinically proven to be safe and are also the go to treatment for cis kids going through precocious puberty). If they decide that actually they're not the gender they thought they were, GOOD.
I want kids to feel safe trying things out. I want kids to experiment with their self expression, be it clothes or hair or gender. If it turns out to be "just a phase" I would far rather it be a phase that they are loved and supported through rather than something they feel is shameful and that they have to hide. I want them to feel like there's no pressure to go one way or the other, just to feel safe to figure themselves out in whatever way makes them comfortable.
Protect trans kids. Protect detrans kids. Protect questioning kids. Full fucking stop.