https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109137
--- Comment #24 from Sam James <sjames at gcc dot gnu.org> --- As a heavy consumer of the branch for our distribution, I'd say it was a (nice) surprise, but then I wasn't expecting it to end up exposing a latent bug (or making it worse). At the end of the day, not much harm done in this case, as we noticed it pretty quickly. glibc also tends to backport tuning improvements (often more invasive than this) which is also sometimes a bit controversial.
