Multiple page tabs not supported

Issue Summary

I needed to create more than one page tab for my drupal site.
I created one with the primary api key (the same used for connect) and everything went fine.
I then created a new facebook application and added it to drupal. I configured the tab and added to my facebook page, but I can't display anything different from what I'm already displaying in the other page (that fortunately continue to work).
The problem seems to be in the $data passed to hook_fb_tab: the content is the same regardless of the tab involved.
While url synced to facebook for canvas pages are different, those for tabs are the same. So, I'm not sure if is a problem of FB calling the same url or the handling in fb_tab module that should recognize the app_id and instead get simply the first one.