Checkerboard pattern overlay in viewport of ContentExamples on Mac

There is a checkerboard pattern shown in the viewport of ContentExamples on Mac.

This does not occur in //UE4/Release-4.15 on CL 3416026.

1. Open ContentExamples.
2. Navigate around the viewport.

Result: There is a checkerboard pattern overlay across the viewport.

Fix UE-51650

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