We specified in 11.6 for asynchronous request in general :
"A GET request to the status monitor resource returns 200 OK once the asynchronous processing has completed. This response MUST include a Content-Type header with value application/http [...]. The response body MUST enclose a single HTTP response which is the response to the initial Data Service Request."

In ODATA-240 we decided to use the exact same pattern also for async Batch Processing. But the example 85 doesn't reflect this fact, we missed to start the response with an 200 OK followed by the Content-Type application/http