$ref schemas result in unknown type

[Void0Walker]

We have encountered an issue with valid swagger files containing refs like this produce response type of unknown.

 responses:
        "200":
          content:
            application/json;charset=utf-8:
              schema:
                $ref: '#/components/schemas/ProductProjections'
          description: Current projections for the requested product.

Looks like explicit definitions of object properties (meaning we don't reference) in every schema mitigates this, but it isn't a good solution.