mod-synthrecord PTR generation doesn't work for RFC 2317 style delegation
Hi,
While testing mod-synthrecord for our use I noticed that reverse generation doesn't work with RFC 2317 style delegated zones.
For example zone named 128/26.2.0.192.in-addr.arpa. doesn't get generated PTR records for 192.0.2.128/26, changing the zone to 2.0.192.in-addr.arpa. with otherwise identical config works.
Tested with Ubuntu Jammy Knot 3.1.6. Don't see any changes to mod-synthrecord code since then.