ID 446959 - mPath renders metals set-up with IOR incorrectly.

Problem summary
mPath renders metals set-up with IOR incorrectly.

Customer reported version
14.1__14.1v1

Customer reported platform
windows10

Steps to reproduce

1) Download and open the attached scene file.
2) Press the F8 key to open the Preview Render window and the F9 key to open the Render window.
3) Notice that if the Render item is set to 'mPath' the item is rendered incorrectly.

Expected behaviour

The material renders the material close to the default renderer.

Actual behaviour
The diffuse channel of the material is totally black, or white in 13.2v1.

Workaround
Unknown.

Reproduced by support

This bug has been reproduced in:

14.1v1 - Windows 10

14.0v1 - Windows 10

13.2v1 - Windows 10

Earliest version tested

13.2v1 - This feature did not exist before this version.