[3.12] gh-118820: Zero-valued flag enum has no name (GH-118848) (GH120758)

gh-118820: Zero-valued flag enum has no name (GH-118848)
(cherry picked from commit ed5ae6c4d76feaff06c2104c8ff864553b000253)

Co-authored-by: Nice Zombies <nineteendo19d0@gmail.com>
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>