I have some CRS3xx series switches with igmp snooping enabled. Two of them are also running as routers and have vrrp enabled.
The problem is that they do no see each other and enable both the vrrp interface.
/interface bridge mdb p does not include 224.0.0.18. This is why I suspect the vrrp multicast packet does not get deliviered
changing to ipv6 does not join ff02::12, so this does not work either