Widget component Navigation does not appear to work with "Recieve Hardware Input" set to true

Widget component Navigation does not appear to work with "Recieve Hardware Input" set to true. When using the arrow keys to navigate the menu, the focus does not change as it would in the 2D equivalent.

1. Download the attached project
2. Open the project
3. Play in editor
4. Click the buttons until one gains focus
5. Use the arrow keys on the keyboard to try and navigate between buttons

Result: The focus does not change when using the arrow keys to try and navigate the menu
Expected: The arrow keys would shift focus (as seen in the 2D equivalent of the widget)