plugin/hosts: fall through unsupported query types (#8193)

plugin/hosts/hosts.go

@@ -50,6 +50,10 @@ func (h Hosts) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (
 	case dns.TypeAAAA:
 		ips := h.LookupStaticHostV6(qname)
 		answers = aaaa(qname, h.options.ttl, ips)
+	default:
+		if h.Fall.Through(qname) {
+			return plugin.NextOrFailure(h.Name(), h.Next, ctx, w, r)
+		}
 	}
 
 	// Only on NXDOMAIN we will fallthrough.