ID 573256 - The VRayMtl (V-Ray 6) shader doesn't work with the Flat or Basic Lighting modes

Problem summary
The VRayMtl (V-Ray 6) shader doesn't work with the Flat or Basic Lighting modes.
 
Customer reported version
Mari 7.0v2
 
Customer reported platform
Windows 10
 
Steps to reproduce

1. Launch Mari and open a Project.
    
2. Create a VRayMtl (V-Ray 6) node and view it.
    
3. In the Project Controls Toolbar, use the Lighting control to switch between the Flat, Basic, and Full Lighting modes.
   Alternatively, you can press F1, F2, and F3 respectively.
   
   

   

 
Expected behaviour
Every Lighting mode should look different by affecting the View as relevant.
 
Actual behaviour
Regardless of the Lightin mode used, the shader always appears as Full Lighting mode in the View.
 
Workaround
Unknown.
 
Reproduced by support
This bug has been reproduced in:
Mari 7.0v2 - Windows 10 - Rocky 9
Mari 7.0v1 - Windows 10 - Rocky 9
 
Earliest version tested
Mari 7.0v1 - This feature did not exist before this version