ID 547303 - Arnold Standard Surface's Anisotropy settings aren't affected by the Environment Light

Problem summary
Arnold Standard Surface's Anisotropy settings don't affect the environment light
 
Customer reported version
Mari 6.0v2
 
Customer reported platform
Multiple
 
Steps to reproduce

1. Create a project, such as the Example Project.
    
2. Create an Arnold Standard Surface node and view it.
    
3. In the Lights palette, make sure only the Environment light is on.
    
4. Open the Node Properties of the Arnold Standard Surface node.
    
5. Change the Specular > Anisotropy setting from 0 to 1

 
Expected behaviour
How light interacts with the shaded object would change.
 
Actual behaviour
Nothing happens. If the user were to use a point light instead of an environment light, they would notice it has an effect. 
 
Workaround
Unknown.
 
Reproduced by support
This bug has been reproduced in:
Mari 6.0v2 - Windows 10 - CentOS 7
Mari 4.5v1 - Windows 10 - CentOS 7
 
Earliest version tested
Mari 4.5v1 - This feature did not exist before this version - Arnold Standard Surface node