Arnold MtlX Standard Surface not translating correctly

[TomMinor]

Describe the bug

• The attached usda contains a grid with an arnold standard surface applied, when rendered through kick it works as expected, but in Solaris (and Husk) I get a default shader (or a black render). For sanity checking purposes, I've also added a sphere with a regular mtlx standard surface applied (this renders correctly)

To Reproduce
Create an Arnold standard surface material in a USD MaterialX Builder in Solaris:

Screenshots
Expected (kick render):

Husk render:

Used Software Versions

• Arnold: 7.3.1 (HtoA 6.3.1.0)
• OS: Windows, Linux

Additional context
Add any other context about the problem here.

mtlx_arnold_standard_surface.zip

[autodesk-oss-arnold-bot]

Issue synced internally to ARNOLD-14911