Importance of properties is ignored

Doing the following on an empty CaosDB instance doesn't even throw a warning.

Create a RecordType Person with obligatory property lastname, e.g., by inserting

Person:
  obligatory_properties:
    last_name:
      datatype: TEXT

and then insert a Person Record without any properties, e.g., by

import caosdb as db
person_rt = db.RecordType(name="Person").retrieve()
person = db.Record(name="TestPerson").add_parent(person_rt)
person.insert()

Since the property lastname is obligatory, I would expect the server to raise an error, but the insertion doesn't even throw a warning (except for the general one about the Entity not having properties at all, of course, but this is not the point).