Sectioning a cut extrude in an Assembly

I'm using 2012 sp5.0

My assembly has a assembly feature cut-extrude. When I do a section on the assembly, the parts that were cut by the cut-extrude will not section. The will show they will be sectioned in the preview but once I click ok the whole part is shown.

Is there some kind of feature scope for the section command?  Or is this a bug?

SolidworksAssemblies