I have attached a small JSF sample application.
The application uses ClientSide State-Saving and does not create a session itself.
There is a conversation scoped bean. The conversation is first created when a link is clicked. The link executes via ajax and updates the form.
When HTTP chunking is enabled (which is default on glassfish) the JSESSION cookie is not properly appended to the response. The conversation is therefore not created and the saved values lost.
There is a second link which demonstartes that everything function correctly if the httpsession is manipulated manually in the same action listener.