ID 375752 - Customised render resolution with Environment Importance Sampling enabled causes principled materials to become dark and noisy

Problem summary
When using "Environment Importance Sampling" with Principled materials, the assigned mesh becomes dark and noisy in the Bucket Renderer. The issue is caused by the render resolution of the camera being overridden. The render resolution needs to be set so that the camera view has a longer height and a smaller width. The problem does not appear when using the Preview Renderer. 

Customer reported version
Modo 12.2v1 

Customer reported platform
Windows 10 

Steps to reproduce

1) Open the attached scene which contains two spheres, a customised camera (1620x3500) and an environment map. The upper sphere is assigned with a principled material and the lower sphere with a physically based material. 

2) Check that "Environment Importance Sampling" in the Global Illumination tab of the Render properties is enabled. 

3) Press "F9" to start rendering the scene. The upper sphere is dark and noisy compared to the lower sphere. 

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4) Go to the render camera's properties and in the Camera View tab disable "Override Render Resolution". 
 

5) Render the scene again and now the upper sphere's colour and reflection are the same as the other lower sphere. 

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​Workaround
Unknown. 

Reproduced by support

This bug has been reproduced in:

Modo 12.2v1 - Windows 10 - MacOSX 11.13 - CentOS 7 

Modo 12.1v2 - Windows 10

Modo 12.0v1 - Windows 10 

Modo 11.2v3 - Windows 10 

Modo 11.2v2 - Windows 10

Modo 11.2v1 - Windows 10 - MacOSX 11.13 

Earliest version tested
Modo 11.2v1 - This feature did not exist before this version. The Shading Model option "Principled" was first integrated into the Modo 11.2 Series. 

Expected behaviour
Principled materials should not be affected by overriding the resolution of the camera with "Environment Importance Sampling" enabled. 

Actual behaviour
Principled materials become dark and noisy when overriding the resolution of the camera.