Query MapField by a key that matches one of the field names in the nested document fails with a mongoengine.errors.InvalidQueryError

Here is the class hierarchy:

class DataItem(EmbeddedDocument):
    key = StringField(required=True)
    value = StringField(required=True)

class MyDoc(Document):
    data = MapField(
        field=EmbeddedDocumentField(DataItem)
    )
    

And the data in db:

{
    "_id" : ObjectId("63a87cb374d6bc3efd9ea570"),
    "data" : {
        "key" : {
            "key" : "1",
            "value" : "test"
        }
    }
}
{
    "_id" : ObjectId("63a87cb374d6bc3efd9ea571"),
    "data" : {
        "a" : {
            "key" : "2",
            "value" : "test"
        }
    }
}

The query MyDoc.objects(data__a__value="test").first() succeeds while the query MyDoc.objects(data__key__value="test").first() fails with mongoengine.errors.InvalidQueryError: Cannot resolve field "value"

Start by reproducing the two MyDoc.objects queries shown in the report and inspect how the MapField path is resolved when the map key is also a nested field name. Trace the InvalidQueryError path and add coverage for both data__a__value and data__key__value, with the latter resolving consistently rather than failing.