That's not necessarily a shame. Keira Bell had already won in any case, discrediting the existing medical protocols, revealing the lack of a sound evidence base, revealing the experimental nature of the treatments, and revealing that "wholly irreversible" was a political/ideological statement rather than a scientific one.
The outcome of her case is the Cass Review, not a hearing in the Supreme Court.
Even if trans activists celebrate an apparent victory they'll know how hollow it is because the uncontrolled medical treatments from before 2020 are not likely to return.