By debugging I mean just checking if you have not blocked broadcast packets at the firewall or some similar misconfiguration. I doubt it’s actual bugs when it doesn’t work. On your second point, it’s actually more resilient than DHCP because it works with IPv6 too.

Idk, just checked my LAN-connected Mac's arp tables now and none of the hostnames are there, even after I ping the multicast. Haven't messed with any settings.