When bringing up a menu from a modal WKInterfaceController presented from the rootController via presentControllerWithName:context:, the modal controller becomes the root controller:
<— Modal (see Cancel)
<— Menu
<— Root? (no Cancel)
Is this a WatchKit bug, or are modal controllers not meant to have menus?
"Solution"
Since this is a known bug, my temporary workaround was just to add a Cancel button to the modal controller and use reloadRootControllersWithNames:contexts: to present them as root. The Cancel button reloads the root controller to my initial root controller.
This is a known bug that is present in WatchKit/iOS 8.2 and 8.3. The issue occurs when you present a modal interface that then presents another modal interface on top (like the Force Touch menu).
You can find a (nasty) workaround here: Apple Watch: Status bar not visible after presenting a modal screen from page based navigation