https://bugs.ntp.org/show_bug.cgi?id=3943

--- ntpd/ntp_io.c	2024-08-12 21:52:15 +0000
+++ ntpd/ntp_io.c	2024-08-12 21:52:15 +0000
@@ -3205,7 +3205,7 @@
 	}
 
 	do {
-		if (INT_LL_OF_GLOB & src->flags) {
+		if (ismcast && INT_LL_OF_GLOB & src->flags) {
 			/* avoid duplicate multicasts on same IPv6 net */
 			goto loop;
 		}