Bugzilla doesn't allow to link to GitHub hosted project and their issue tracker.
Links -> URL
The result is a error:
The external tracker URL you specified does not belong to a tracker known to Red Hat Bugzilla
I assume it's simply missing.
2021-03-31
The fedora infrastructure does not run nor maintain bugzilla, you can contact the bugzilla maintainers by opening a ticket on bugzilla itself: https://bugzilla.redhat.com/enter_bug.cgi?product=Bugzilla
Metadata Update from @pingou: - Issue close_status updated to: Invalid - Issue status updated to: Closed (was: Open)