PostgresPartitionedModels cannot be used as abstract models

[wesleykendall]

For example:

class PartitionedEvent(PostgresPartitionedModel):
    class PartitioningMeta:
        method = PostgresPartitioningMethod.RANGE
        key = ["pgh_created_at"]

    pgh_created_at = models.DateTimeField()

    class Meta:
        abstract = True


class ConcretePartitionEvent(PartitionedEvent):
    pass

When calling manage.py pgmakemigrations, it will produce a migration with operations that look like this:

operations = [
        psqlextra.backend.migrations.operations.create_partitioned_model.PostgresCreatePartitionedModel(
            name='ConcretePartitionEvent',
            fields=[
                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                ('pgh_created_at', models.DateTimeField()),
            ],
            options={
                'abstract': False,
            },
            partitioning_options={
                'method': psqlextra.types.PostgresPartitioningMethod['RANGE'],
                'key': [],
            },
            bases=(psqlextra.models.partitioned.PostgresPartitionedModel,),
            managers=[
                ('objects', psqlextra.manager.manager.PostgresManager()),
            ],
        ),
        psqlextra.backend.migrations.operations.add_default_partition.PostgresAddDefaultPartition(
            model_name='ConcretePartitionEvent',
            name='default',
        ),
    ]

Notice how "key" is []. This results in

django.core.exceptions.ImproperlyConfigured: Model 'ConcretePartitionEvent' is not properly configured to be partitioned. Set the `method` and `key` attributes on the `PartitioningMeta` class as a child of 'ConcretePartitionEvent'

When I simply make the parent model a concrete model, everything works as expected.

I couldn't find anything in the docs. Is this expected behavior?

Django=3.2.15 django-postgres-extra=2.0.4