GI not rendering correctly

When combined with a skybox, GI does not give a realistic rendering. What seems to be bounced light from adjacent surfaces gives bright areas near corners. The effect depends on viewing angle and only appears when both a skybox is used and GI is enabled (quality does not matter.)

Test scene: https://atlas.sansar.com/experiences/cainmaven/the-folly-wip 

The scene contains a single, continuous mesh that has a white material with 100% roughness and 0% metallic. There is one point light.

No skybox, no GI:

No skybox, std GI:

Bright Clouds skybox, no GI:

Brights Clouds, std GI:

Notice the bright bands near the top of the wall and on the floor by the wall -- clearly not realistic,


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