1.3.3: Running database migration fails on new install

After installation of hyperkitty 1.3.3 and trying to run django-admin migrate I get:

Operations to perform:
  Apply all migrations: account, admin, auth, contenttypes, django_mailman3, django_q, hyperkitty, openid, sessions, sites, socialaccount
Running migrations:
  Applying contenttypes.0001_initial... OK
  Applying auth.0001_initial... OK
  Applying account.0001_initial... OK
  Applying account.0002_email_max_length... OK
  Applying admin.0001_initial... OK
  Applying admin.0002_logentry_remove_auto_add... OK
  Applying admin.0003_logentry_add_action_flag_choices... OK
  Applying contenttypes.0002_remove_content_type_name... OK
  Applying auth.0002_alter_permission_name_max_length... OK
  Applying auth.0003_alter_user_email_max_length... OK
  Applying auth.0004_alter_user_username_opts... OK
  Applying auth.0005_alter_user_last_login_null... OK
  Applying auth.0006_require_contenttypes_0002... OK
  Applying auth.0007_alter_validators_add_error_messages... OK
  Applying auth.0008_alter_user_username_max_length... OK
  Applying auth.0009_alter_user_last_name_max_length... OK
  Applying auth.0010_alter_group_name_max_length... OK
  Applying auth.0011_update_proxy_permissions... OK
  Applying auth.0012_alter_user_first_name_max_length... OK
  Applying sites.0001_initial... OK
  Applying django_mailman3.0001_initial... OK
  Applying django_mailman3.0002_maildomain... OK
  Applying django_q.0001_initial... OK
  Applying django_q.0002_auto_20150630_1624... OK
  Applying django_q.0003_auto_20150708_1326... OK
  Applying django_q.0004_auto_20150710_1043... OK
  Applying django_q.0005_auto_20150718_1506... OK
  Applying django_q.0006_auto_20150805_1817... OK
  Applying django_q.0007_ormq... OK
  Applying django_q.0008_auto_20160224_1026... OK
  Applying django_q.0009_auto_20171009_0915... OK
  Applying django_q.0010_auto_20200610_0856... OK
  Applying django_q.0011_auto_20200628_1055... OK
  Applying django_q.0012_auto_20200702_1608... OK
  Applying django_q.0013_task_attempt_count... OK
  Applying socialaccount.0001_initial... OK
  Applying socialaccount.0002_token_max_lengths... OK
  Applying socialaccount.0003_extra_data_default_dict... OK
  Applying hyperkitty.0001_initial... OK
  Applying hyperkitty.0002_auto_20150311_0913... OK
  Applying hyperkitty.0003_thread_starting_email... OK
  Applying hyperkitty.0004_archived_date_and_subject... OK
  Applying hyperkitty.0005_MailingList_list_id... OK
  Applying hyperkitty.0006_thread_on_delete... OK
  Applying hyperkitty.0007_allauth_20160808_1604... OK
  Applying hyperkitty.0008_django_mailman3_profile... OK
  Applying hyperkitty.0009_duplicate_persona_users... OK
  Applying hyperkitty.0010_email_sender_name... OK
  Applying hyperkitty.0011_email_parent... OK
  Applying hyperkitty.0012_thread_order_null... OK
  Applying hyperkitty.0013_mailinglist_id_1...Traceback (most recent call last):
  File "/usr/bin/django-admin", line 33, in <module>
    sys.exit(load_entry_point('Django==3.1.2', 'console_scripts', 'django-admin')())
  File "/usr/lib/python3.8/site-packages/django/core/management/__init__.py", line 401, in execute_from_command_line
    utility.execute()
  File "/usr/lib/python3.8/site-packages/django/core/management/__init__.py", line 395, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/lib/python3.8/site-packages/django/core/management/base.py", line 330, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/usr/lib/python3.8/site-packages/django/core/management/base.py", line 371, in execute
    output = self.handle(*args, **options)
  File "/usr/lib/python3.8/site-packages/django/core/management/base.py", line 85, in wrapped
    res = handle_func(*args, **kwargs)
  File "/usr/lib/python3.8/site-packages/django/core/management/commands/migrate.py", line 243, in handle
    post_migrate_state = executor.migrate(
  File "/usr/lib/python3.8/site-packages/django/db/migrations/executor.py", line 117, in migrate
    state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
  File "/usr/lib/python3.8/site-packages/django/db/migrations/executor.py", line 147, in _migrate_all_forwards
    state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
  File "/usr/lib/python3.8/site-packages/django/db/migrations/executor.py", line 227, in apply_migration
    state = migration.apply(state, schema_editor)
  File "/usr/lib/python3.8/site-packages/django/db/migrations/migration.py", line 114, in apply
    operation.state_forwards(self.app_label, project_state)
  File "/usr/lib/python3.8/site-packages/hyperkitty/migrations/0013_mailinglist_id_1.py", line 19, in state_forwards
    state.models[app_label, self.model_name_lower].fields.insert(0, (
AttributeError: 'dict' object has no attribute 'insert'

The dict in question contains

{'name': <django.db.models.fields.CharField>, 'display_name': <django.db.models.fields.CharField>, 'description': <django.db.models.fields.TextField>, 'subject_prefix': <django.db.models.fields.CharField>, 'archive_policy': <django.db.models.fields.IntegerField>, 'created_at': <django.db.models.fields.DateTimeField>, 'list_id': <django.db.models.fields.CharField>}

I'm not entirely sure what to do here, but this basically breaks installing hyperkitty on Arch Linux right now :-/