Response error schema code generation

[kdynan]

Hello, I am trying to generate a csharp client using Swagger 2.0 and Swagger Codegen v2.4.21. My Swagger file describes API responses with different schemas based on status codes:

responses:
200:
description: "successful operation"
schema:
type: "array"
items:
$ref: "#/definitions/AppointmentAddResult"
400:
description: "Bad request"
schema:
$ref: "#/definitions/BatchAppointmentAddErrorBody"

Models are generated for both schemas, however the model for the 400 response code is not used anywhere in the generated client. Is this expected behavior? I would have expected code to be generated to actually create objects based on the JSON returned with the 400 status code. Any help would be greatly appreciated. Thanks.