tvOS SplitViewController not showing its MasterViewController

Hello, I'm trying to build a tvOS app and I'm having issues using SplitViewController inside a Tab Bar Controller. The app is built with Swift and UIKit and uses Storyboards.

Main interface is a fullscreen view that plays some live video stream. User can open a menu, which is a Tab Bar Controller that overlays the video.

Now, I want one of this Tabs (a Settings screen) to contain a SplitViewController so that I can have another menu on the left for various categories of settings.

So I have dragged a SplitViewController in my storyboard. It displays well in the Interface Builder, with a Master view on the left side and the Detailed view on the right side. However, as soon as I Ctrl-drag from my TabBarViewController to the SplitViewController in order to add the relationship segue that will make this SplitViewController a new tab inside my TabBarController, then the MasterViewController inside the SplitViewController disappears and the Detailed view takes the entire space. When I run the app on a device, I do see the same thing. I can't see the left master view.

I can't figure out why, any help would be appreciated.

tvOS SplitViewController not showing its MasterViewController
 
 
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