The Bonjour service is always listed as stopped. Thats a bug/feature 😉
Hm, there are various bonjour/rendezvous/mDNS tools out there that allow you to browse through the findings.
Safest thing is to use wireshark / tcpdump / etc. to check all the packets and change the filters accordingly.
I’m not so sure about those multicast rules of yours…. 🙄