Ray Traced Distance Field Shadows Break At Certain View Angles and FOV

RTDFS start to disappear or have visual artifacts when the camera's FOV dips below 90.
Also, the smaller the FOV is the easier it is to reproduce the issue.

It should be noted that I can only get the flickering to appear while looking at the corner. Turning away from the corner allows for the shadows to return.

1. Open attached project
2. PIE and look at the corner shown in attached screenshot
3. Press and hold the "F" key so that the camera's FOV angle changes from 90 to 60
4. Look up and down

RESULT
The RTDFS disappear, flicker, or have large artifacts as you look upwards.

EXPECTED
The RTDFS do not look visually different when changing FOV or View angle.

Fix UE-51650

i have this problem UE4CC-Windows-58DC12AF4B97F057BD108FBFF569B2E9_0000

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