Comment 1 for bug 1809313

I think that's because we don't create resources for disabled networks any more and {{role.name}}HostnameResolveNetwork maps to internal-api[1] that you've disabled in your network_data.yaml.

If you've to disable internal_api network, you've override ServiceNetMap to set {{role.name}}HostnameResolveNetwork to ctlplane (the only one enabled).

[1] https://github.com/openstack/tripleo-heat-templates/blob/master/network/service_net_map.j2.yaml#L92

On master you're seeing the old behaviour as you're probably not using the latest.