I guess I did not check since i was not using the body of the review comments anywhere.  I just tried everything I could think of and your are correct it is not working, although githubs diagnostic `X-GitHub-Media-Type:` is getting the correct settings (so we are passing it across correct). 

I submitted a request to their support (I am not hopeful of getting a response) but until we show/user the comments for more then length and user data we are not being harmed, :frowning: