Tennessee has banned gender affirming care for minors (including hormone therapy, it is not limited to surgery). This ruling has been allowed by a federal court to take effect. This case seems likely headed for the supreme court.
Children cannot be denied a life-saving blood transfusion on the grounds that their parents are Jehovah's Witnesses and that it violates their freedom of religion - at least based on my understanding, please correct me if that's wrong. This Tennessee ban strikes me almost as the opposite - as if JW's managed to get a ban on blood transfusions for minors enforced by the state. The legal argument seems almost the other way around, that children should not be legally able to be denied.
If the child's life is at risk (and that's demonstrable in many of these cases), and the child's doctors believe that this is a necessary treatment to address that risk, it strikes me that Tennessee should have the exact opposite law - that the child's guardians can be forced to allow treatment.
What this law is saying is that even if the child's doctors and parents all agree, the state has prevented them from taking this course of action, which could be a life-saving act. Pretty far out of bed with where it should be.