See https://pdc.fedoraproject.org/rest_api/v1/releases/?version=39 . The first result is a dict (containing the main series of Fedora 39 composes) with its 'name' set to "Fedora 39". That is wrong - it is inconsistent with all previous releases. In all previous releases, that dict's 'name' is "Fedora". See https://pdc.fedoraproject.org/rest_api/v1/releases/?version=38 , https://pdc.fedoraproject.org/rest_api/v1/releases/?version=37 and so on.
Fixed:
curl -X PATCH "https://pdc.fedoraproject.org/rest_api/v1/releases/fedora-39/" -H "Authorization: Token $TOKEN" -H "Content-Type: application/json" -d '{ "name": "Fedora" }'
Metadata Update from @humaton: - Issue close_status updated to: Fixed with Explanation - Issue status updated to: Closed (was: Open)