Missing migration

When I build Debian packages with master and install them in an LXD container I get the following message

Your models have changes that are not yet reflected in a migration, and so won't be applied.
Run 'manage.py makemigrations' to make new migrations, and then re-run 'manage.py migrate' to apply them.

If I run ./bin/maas-region makemigrations the follow migration is generated

# -*- coding: utf-8 -*-
# Generated by Django 1.11.11 on 2018-09-26 22:33
from __future__ import unicode_literals

from django.db import migrations

class Migration(migrations.Migration):

    dependencies = [
        ('maasserver', '0178_break_apart_linked_bmcs'),
    ]

    operations = [
        migrations.AlterUniqueTogether(
            name='bmc',
            unique_together=set([('power_type', 'power_parameters', 'ip_address')]),
        ),
    ]

As the BMC model itself hasn't changed I beleive this is due to f91442a