Kees Monshouwer reported that adding
secure-delegated IN DS 54319 8 2 a0b9c38cd324182af0ef66830d0a0e85a1d58979c9834e18c871779e040857b7
secure-delegated IN NS ns1.secure-delegated.dnssec-parent.com.
secure-delegated IN NS ns2.secure-delegated.dnssec-parent.com.
ns1.secure-delegated IN A 22.214.171.124
ns2.secure-delegated IN A 126.96.36.199
to dnssec-parent.com makes verify-dnssec-zone with "NS exists, but NSEC3 does not mention it for secure-delegated.dnssec-parent.com."
fix missing NSEC3 for secure delegation, thanks @mind04, closes #682