Discovery: responses are sent to wrong destination

When a server is running with discovery and a client sends a mDNS query in order to find servers, the server is responding to the wrong destination: It responds to its own address (e.g. 127.0.0.1), but the mDNS RFC specifies

the destination UDP port in all Multicast DNS responses MUST be 5353, and the destination address MUST be the mDNS IPv4 link-local multicast address 224.0.0.251 or its IPv6 equivalent FF02::FB