I can't see how anyone is still so dim as to accept the idea that being gay (or bi) belongs in the same category as being, or thinking you are trans, especially for minors.
Aside from the qualitative differences, like the fact that being trans can't be defined or proved whereas being gay is an external reality related to who you want to be with romantically/sexually - the consequences of blind affirmation of a trans identity in a minor are absolutely huge, orreversible and potentially massively harmful.
A young person says they're gay, so what? Of course they shouldn't be pressured to not be gay/subject to "conversion therapy", that should not be allowed – but being gay isn't something that requires them to make any decisions. Maybe it's a phase, or influenced by wanting to be cool or piss off their parents (like some temporarily gay people I knew in the 80s), maybe not. It doesn't matter because they can change their minds at any point - as straight people can and do too. You can just say "Oh, thanks for telling me, I love you whatever, but remember you're young and there's no pressure to decide this right now."
Saying you're trans is totally different because it comes with medical interventions and decisions that absolutley should be subject to a process of questioning, making sure that is the best thing for that person, and checking for other factors that could have made them feel that way, such as sexual abuse, to make sure they don't make a trult awful and irreversible mistake.
That's the important difference. Aside from the fact that gender ideology is based on zero evidence, illogical, sexist and regressive, no one should be entering into that treatment like that without a significant process of checks and MH support, and especially not as a minor. Of COURSE that should result in some of them changing their minds, as the stats show over 80% change their minds anyway if left alone.
That is not "conversion therapy".