Unable to view schema model in Developer Portal

I have created a spec which has schema definitions and extensions of existing schema as well.

I have used the "allOf" property to extend the existing schema.

I am able to see the schema model through swagger editor but the same when uploaded (in .yml format) in developer portal does not render properly.

PFB spec snippet:

definitions:
    
  Address:
    type: object
    properties:
      id:
        description: Unique identifier of the address
        type: string
      href:
        description: An URI used to access to the address resource
        type: string
     ...
     ...
    
  GeographicAddress:
    allOf: 
      - $ref: '#/definitions/Address'
      - type: object
        properties:
            Country:
                description: The country for the address
                type: string