arp responder rule sometimes missing after reboot vm

scenario :
I created vm and associate floating ip.
checked ping and recevied reply.
Then I reboot the vm and saw on table 81 that the router gateway rule was missing.

As we can see on tempest test - tempest.scenario.test_network_advanced_server_ops.TestNetworkAdvancedServerOps.test_server_connectivity_reboot

https://logs.opendaylight.org/releng/jenkins092/netvirt-csit-3node-openstack-newton-nodl-v2-upstream-learn-boron/62/archives/log.html.gz#s1-s1-s1