This is not unusual; many medicines have side-effects, and we make cost/benefit estimates based on our knowledge of them. This is the "informed" part of "informed consent".
None of this is controversial as such. Some people are so worried that the "anti-woke warriors" will abuse any negative outcomes that it is now near-taboo, and apparently the activists prefer to uphold the unsubstantiated myth there are no side-effects. This is harmful not just to the people taking puberty blockers, but also to the public debate in general. Those same anti-woke warriors can now claim all sorts of things and you have very little to counter it with, because we just don't know. Also doesn't exactly instil trust in the movement either.