Trying to do a "join" on a ListField(ReferenceField(...)) doesn't raise an exception

I have two models, let's say:

class Article(Document):
    title = StringField()
    tags = ListField(StringField())

class Blog(Document):
     articles = ListField(ReferenceField(Article))

I expected that Blog.objects.filter(articles__tags='lemon') would return the list of blogs that have at least one article using the tag lemon, but it just returns an empty set.

Is it the expected behaviour or a bug? Could it be supported?

Regards,

Start by reproducing the issue with the Article and Blog models shown in the report, then run Blog.objects.filter(articles__tags='lemon') against data containing a matching referenced article. Trace how the filter handles ListField(ReferenceField(...)) joins and compare the result with the expected matching blogs. Done means the behavior is documented or the query is supported with coverage for this example.