Steps to reproduce:

1) Download attached project 'case_794736-ScreenShotPizzas.zip' and open in Unity
Note: Make sure you downloaded osig file of device you will be testing and place it in project files
2) Make sure Virtual Reality Supported enabled
3) Build and run project on a device
4) Tap the touch pad to capture screenshots
5) Look at the files in a file browser and notice that they are all black

Expected result: Screenshots suppose to be as you can see in a view
Actual result: Screenshots are black

Note: Works fine in Editor if VR enabled
Note: Works fine on device if VR disabled

Reproduced with: 5.2.4f1, 5.3.6p6, 5.4.1p2, 5.5.0b5