Oculus mirror window goes black when headset removed for any mirroring mode besides 0

If using any hmd mirroring mode besides 0 on Oculus, when the headset is removed, the mirroring window goes black in a packaged build, or in -game, for example:

UE4Editor.exe VrTemplate4x15 MotionControllerMap -game

Oculus mirror window goes black when headset removed for any

Developer says this is important because it is "TRC for Oculus" to have a mirror mode that is not stereo and to have the screen not go black when you remove the headset, but I have not verified the TRC requirements myself.

1. Create a new project based on the VR Template
2. Open the MotionControllerMap's level blueprint and add the following nodes
   • [Link Removed]
3. In the HMD mirror mode command, anything besides 0 will exhibit the issue (1, 2, 3, 4 all exhibit the problem)
4. Save map, launch with this command with the Oculus attached

   UE4Editor.exe VrTemplate4x15 MotionControllerMap -game

5. Put on the Oculus, wait for rendering to start, then remove oculus
6. Notice the preview window is visible for a brief period, but then goes black once headset has been removed for ~1s

Desired results: same as "HMD mirror mode 0": game is paused when Oculus headset is removed, but game screen is still visible.