Add missing icon contexts to the kde4_install_icons() macro.
In case you didn't know it (I didn't as of a few minutes ago):

You can use the exact icon context names in the filenames of your installed icons. If you ever wondered where the "app" in ox22-app-mykdeapplication.png came from: that's just KDE 3 compatibility. Using the real name of the context, "apps", works just as well: ox22-apps-mykdeapplication.png

(This also works with "actions", "status", "places" and whatever icon contexts the icon naming specification defines.)