ID 445746 - Specular values appear to render incorrectly when using the Principled material.

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Problem summary
Specular values appear to render incorrectly when using the Principled material.

Customer reported version
modo.n/a

Customer reported platform

Steps to reproduce
1) Open Modo.
2) Select File > Open and open the provided scene.
3) Render the image.
Result: Rendered image will appear to have softer and brighter highlights than expected.

Expected behaviour
The rendered image should have similar specular values to other principled shaders.

Actual behaviour
The rendered image has brighter specular values than expected.

Workaround
Unknown.

Reproduced by support
This bug has been reproduced in:
14.1v1 - Windows 10
14.0v2 - Windows 10
13.2v1 - Windows 10
13.1v1 - Windows 10
13.0v1 - Windows 10
12.2v2 - Windows 10
12.2v1 - Windows 10
12.1v2 - Windows 10
12.1v1 - Windows 10
12.0v1 - Windows 10

Earliest version tested
12.0v1 - Windows 10 - This issue appears to be in all versions of the product

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