iOS8 UIToolbar disappearing when showing detail view controller

Question

I'm working with an app using a UISplitViewController as the window's root. I would like both the master and the detail view controllers to be a UITableViewController inside of a UINavigationController, with the UIToolbar visible. In a horizontally regular size width, this works fine, as displayed:

The problem is in a horizontally compact size class, where the UISplitViewController is pushing the detail view controller onto a stack like a UINavigationController, the toolbar disappears as the detail is being shown, and reappears after the detail is fully popped (see below). I'd like for the toolbar to remain in place as it does with a normal navigation controller.

Sample project uploaded here.