Encore decks 11 @ 12 questions

[mlbcruiser]

On the deck plans for the Encore, there are a lot of spaces or openings in the deck layout where you can’t tell what is located there. I’m particularly curious as to the area directly behind the aft staircase? 
 

Have wondered about spaces that show no title on deck 12 as well. Any help appreciated.

[RedwingHockeyFan]

It is usually Crew area.