One study showed that, without social transition, nearly two-thirds of pre-teen gender-dysphoric males grow up to be gay or bisexual.
A University of Toronto study  found that 63.6% of boys with early onset gender dysphoria, who received ‘watchful waiting’ treatment and no pre-pubertal social transition, grew up to be gay or bisexual.
Only 12% of the study participants continued to identify as transfeminine.
 Singh, D., Bradley, S.J. & Zucker, K.J. (2021). A Follow-Up Study of Boys With Gender Identity Disorder. Frontiers in Psychology 12. [Link]