Dismissing "Place phone into daydream headset" leaves app at black screen

Currently experiencing an issue when re-entering Google Daydream game after exiting the Daydream setup (place your phone in headset) screen by pressing the x in the top left corner of the screen. When the game is booted back up again sporadically just being presented by a completely black screen - the screen divider line is not even showing up.

(Was observed on both Pixel and Pixel XL)

Can be reproduced with attached project.

1. Launch the app
2. Close the 'Place your phone into the Daydream headset' screen by clicking the x in the top left of that screen (this closes the app)
3. Repeat the above two steps
4. The third time opening the app you will observe a plain black screen.

This has been observed in a project with no special blueprints or settings, other than the absolute basics of an unreal google daydream project, as outlined here: https://docs.unrealengine.com/latest/INT/Platforms/GoogleVR/QuickStart/index.html

Also reproducible by pressing the x while app is running and attempting to relaunch(resume?) with app switcher.

UE4.21 Daydream Controller is not tracking