> > In this particular case, isn't the resolver attempting to do a reverse > lookup of the IP address that's listed ? > > You are right, I missed that this is a reverse-mapping zone. In that case, run DNSSEC analyzer on the domain "180.96.34.in-addr.arpa" and you'll see the problem. Reverse-mapping zones work the same as forward-mapping zones, they also need to be delegated properly.
If you prefer a more visual output, try DNSViz: https://dnsviz.net/d/180.96.34.in-addr.arpa/dnssec/
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