loss 50% packets when upgrade from 5.0.0 to latest of stable/rocky

[sapd]

I have installed networking-ovn from ubuntu cloud repository.

 dpkg -l | grep ovn
ii networking-ovn-common 5.0.0-0ubuntu2~cloud0 all OpenStack virtual network service - OVN driver
ii python-networking-ovn 5.0.0-0ubuntu2~cloud0 all OpenStack virtual network service - OVN driver

This is not latest version for rocky release ( latest is 5.0.1). So I clone repo (with branch stable/rocky) then upgrade manualy

After that, I re-sync ovn database using this command:

neutron-ovn-db-sync-util --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/plugins/ml2/ml2_conf.ini --ovn-neutron_sync_mode repair

then all VM with Floating IPs loss 50% packets.

Step to re-proceduce:

1) install networking-ovn from ubuntu repo stable/rocky
2) Create VM with FIPs
3) upgrade to latest branch stable/rocky
4) resync with mode repair

Step to fix

1) stop ovsdb-nb-db
2) remove ovnnb_db.db
3) start ovsdb-nb-db
4) re-sync

Then re-associate FIPs

1) disassociate all floating IPs (release not required)
2) clear router's external gateway
3) re-add router's external gateway - all vms now have full connectivity
4) re-attach floating ips