Removing and replacing an Atmospheric fog causes hard line issue in SkySphere

When deleting and replacing the atmospheric fog with another atmospheric fog there will be a noticeable artifact near the sun disc from the SkySphere.

Image attached.

Tested in 4.11 stream CL-2811790

1. Open UE4
2. Open New Default Level
3. Delete Atmospheric Fog
4. Add Atmospheric Fog from Modes Panel
5. Look towards Light Sources Sun Disc on the SkySphere BP

Results: Noticeable artifact near the sun disc on the sky sphere.

Expected: Atmospheric Fog will not produce any noticeable artifacts

Regression: Yes

[UE-23848] Bug Status

Fix UE-51650

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