Comment 3 for bug 1845303

I have a peek at some potentially relevant changes that have landed and I suspect this one may be relevant - https://review.opendev.org/#/c/682608/. The code that's getting stuck is at [1]. I checked the good and bad envs and I can confirm that in the working one the o-hm0 port is assigned a vlan tag:

        Port "o-hm0"
            tag: 2
            Interface "o-hm0"
                type: internal

but in the broken env it has not.

[1] https://github.com/openstack/neutron/blob/stable/stein/neutron/agent/linux/openvswitch_firewall/firewall.py#L522