I am using a webhook from my alexa skill. Within the webhook, when i receive the request, i immediately send a progressive message back to the device. I then will process my request (in my test bed, it's just a thread.sleep for 3 seconds, and then i send back a generic ssml message). What i expected to happen was the progressive message to play roughly 3 seconds before my response. However, upon testing, the progressive message almost seems to wait for the full response, plays, and then immediately plays the full response. Is this the expected behaviour? if so, how is this any different than me prepending "Alright, give me a second to look that up for you" to my full response. i get the same experience.