sub_sections not showed in inherited class if no quantity is present

I already know that this case can be solved using the lines:

      m_annotations:
        eln:
          dict()

Anyway, this is not working in the following scheme and hence I had to add a test quantity (as suggested by @mnakh when testing it).

It actually works if I instantiate an Entity archive file, but not when creating a Material archive file that inherits from Entity.

definitions:
  name: 'Test'
  sections:  # Schemes consist of section definitions
    Entity:
      m_annotations:
        eln:
          dict()
      base_sections:
        - nomad.datamodel.data.EntryData
      sub_sections:
        responsible_person:
          section:
            quantities:
              user:
                type: User
                shape: ['*']
                m_annotations:
                  eln:
                    component: UserEditQuantity
    Material:
      base_section: '#/Entity'

this is the same file where I added the 'test' quantity

definitions:
  name: 'Test'
  sections:  # Schemes consist of section definitions
    Entity:
      m_annotations:
        eln:
          dict()
      base_sections:
        - nomad.datamodel.data.EntryData
      quantities:
        test:
          type: str
          m_annotations:
            eln:
              component: StringEditQuantity
      sub_sections:
        responsible_person:
          section:
            quantities:
              user:
                type: User
                shape: ['*']
                m_annotations:
                  eln:
                    component: UserEditQuantity
    Material:
      base_section: '#/Entity'