https://bugzilla.redhat.com/show_bug.cgi?id=2004265
--- Comment #18 from Parag Nemade pnemade@redhat.com --- Thank you Jens for the screenshot.
Like I said in my initial comment its from iso-codes package.
Thanks to Julian for this https://salsa.debian.org/iso-codes-team/iso-codes/-/merge_requests/24 link which have some discussion around this bug.
It appears upstream considers https://www.iso.org/obp/ui/#iso:code:3166:TW as official source but how to get this entry changed is the question now?