If possible, collect the following outputs and open a GTAC case to analyze the issue:
1. show mcast cache
2. debug hal show ipv4mc
3. debug hal show platform ipv4mc
4. debug hal show forwarding distributions system
5. show forwarding configuration
6. show igmp snooping
7. show igmp group
8. show tech
9. show log messages nvram
10. Detailed Topology diagram