Do you mean when it’s not published yet? But just a Draft?
Unfortunately no. After the post is published, the second block content is not appearing on new posts. This started happening after I updated to WordPress 3.9.1.
How about if you visit this post in the front-end? Or if you turn of HTTP requests at Settings > Multiple content blocks (and then visit the post)?
I have just tested 3.9.1 and 4.0alpha and it still seems to be working.
I tried the suggestions and after I turned off the HTTP requests and then turned it back on it started working again. Seems like it must have just been a glitch and just needed a reset.
Thanks for your help!