Fixed GLUE records return on NS requests.

src/blockchain/filter.rs

@@ -281,10 +281,13 @@ impl DnsFilter for BlockchainFilter {
                 };
 
                 // Check if this domain has NS records and needs to resolve all records through them
+                // But skip this if we're querying for NS records themselves - return them directly
+                if qtype != QueryType::NS {
                     let (has_ns, result) = Self::resolve_by_ns(qname, qtype, &top_domain, &data, recursive);
                     if has_ns {
                         return result;
                     }
+                }
 
                 let mut answers: Vec<DnsRecord> = Vec::new();
                 let mut cname: Option<DnsRecord> = None;