OVN Network Metadata is broken if allowed-address is configured using the same IP

Issue

• Openstack OVN network metadata is broken for only specific network(s).
• OVN metadata proxy does not start for a specific network.
• The following log entry is present in ovn metadata agents, example:

Jun 27 13:59:45 compute18-node2 ovn_metadata_agent[2307]: 2025-06-27 13:59:45.834 2473 DEBUG neutron.agent.ovn.metadata.agent [-] There is no metadata port for network 30eba16f-5e67-44d5-9560-7f49a60d9d85 or it has no MAC address configured, tearing the namespace down if needed _get_provision_params /usr/lib/python3.9/site-packages/neutron/agent/ovn/metadata/agent.py:682