veganfishtacos

I'm trying to add some interior walls into a room with cathedral ceilings.  I need the interior (dividers) to extend to the roof.  By default it seems they don't.  They disappear at the classical ceiling height... and a space is cut out of the roof where they would appear.  To reporduce

1) Draw a box room with exterior walls.  

2) Vault the ceiling

     Select room >> Room Specification >> Structure >> Uncheck "Flat Ceiling Over This Room"

3) Add an interior wall extending from any exterior wall out into the room

4) Add a floor camera to inspect your work

There's a hole in the ceiling now.  And the walls is like a pony wall or something.  It stops well short of the ceiling.  I need it to go all the way up to the ceiling.  

Attached is a floor camera view of the shelf ceiling that the tool likes to make and my "Room Specification>>Structure" dialog box.  Any ideas?