It looks like the bug in the Neutron. Similar bug was fixed in commit https://github.com/openstack/neutron/commit/60cb0911712ad11688b4d09e5c01ac39c49f5aea
Same thing happens with QoS, but QoS plugin never restores lost QoS rules: https://github.com/openstack/neutron/blob/stable/pike/neutron/agent/l2/extensions/qos.py#L257
It looks like the bug in the Neutron. Similar bug was fixed in commit https:/ /github. com/openstack/ neutron/ commit/ 60cb0911712ad11 688b4d09e5c01ac 39c49f5aea
Same thing happens with QoS, but QoS plugin never restores lost QoS rules: https:/ /github. com/openstack/ neutron/ blob/stable/ pike/neutron/ agent/l2/ extensions/ qos.py# L257