Why do you think it is not a tzdata bug? time-admin merely shows timezones as reported by /usr/share/zoneinfo/zone.tab, which is shipped by tzdata, so the real bug must be there.
Why do you think it is not a tzdata bug? time-admin merely shows timezones as reported by /usr/share/ zoneinfo/ zone.tab, which is shipped by tzdata, so the real bug must be there.