Shadows do not consider terrain that is outside of the rendered scene

[srothst1]

This bug occurs when terrain shadows are enabled. As one zooms closer to a shaded region, the region becomes un-shaded since the terrain which shaded the area is no longer in the current scene. Put simply - a shaded region becomes un-shaded when the source of the shadow is no longer in the current scene.

Source of shadow is in the scene (see right side):

Source of shadow is not in the scene:

I have tried solutions related to enforcing shadows and they do not seem to fix this bug. I recognize that this issue was discussed in an early shadows roadmap #2594. Finally, here the community discussion that brought this issue to my attention.

Sandcastle example: https://sandcastle.cesium.com/?src=Shadows.html

Browser: Chrome

Operating System: Windows

Let me know if there are any questions or concerns!