Comment 4 for bug 1866139

Neutron ovs agent don't sends GARPs for VM's IPs. It should be probably, as Bence said qemu's responsibility to send that.
Hoverwer in Rocky we introduces this new multiple port bindings feature. Maybe there is some race between when Nova is configuring and running qemu process on dst host and how neutron-ovs-agent is wiring this port.
Can You try to check if such garps are maybe visible on tap<port_id> interface and dropped somewhere in br-int/br-ex maybe?