Fresnal Preview in Material Editor Thumbnail produces Strange Result when Zooming

When making a Simple Fresnal node inside of the Material Editor and plugging it into the Basic Color node it returns strange values for the preview. Specifically the dark inner color will move off to the side. This occurs when using the scroll wheel on the mouse. Upon trying to zoom with the right mouse button then the material preview returns to normal. Separate issue is if zoomed out far enough with the right mouse button used only, then the middle mouse wheel doesn't zoom in or out.

1. Open the UE4 Editor
2. Create a Material
3. Create a Fresnal Node and plug that into Basic Color
4. Try to scroll in and out with the mouse wheel
5. Then zoom using the right mouse button

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