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When HttpResponse.Body is replaced, the replacement is used for future requests #940
This is a contrived example to illustrate the point:
Run the application and browse to it. The first request returns nothing (content was written to the MemoryStream). Subsequent requests will hit the Exception.
The real-world case is when the Body stream is decorated for a given request. The decorator stream will be re-used for a subsequent request, which could result in re-decorating the stream, and ultimately produce a long chain of decorators.
It appears that Kestrel is trying to be efficient by re-using its underlying Stream instances. But the reusable instances are being replaced, with unintended consequences for future requests.