render region autoscale causing blank buckets when rendering VRayEnvironmentFog

[mojofutbol]

I've been rendering a VRayEnvironmentFog scene with one vray rect light using the directional parameter. I noticed that the more I increased the directional parameter towards 1, the more black buckets I would get. After trying out many different tests, I found that turning off the autoscale regions in the render globals fixed the problem. Is this a bug, or are the buckets not able to calculate properly when autoscale regions is on.
I'm using vray 3.05.04 an using maya 2015 sp4 FYI.

[ivaylo.ivanov]

Can you show a picture of the issue?