Anisotropy of base disappears when clear coat is greater than 0 when Substrate is enabled

Anisotropy from the base of a material disappears when clear coat is used.

Car paint with base specular_anisotropy at 0.5 and coat at 0.0

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When coat is 0.0:

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1. Enable Substrate
2. Download and import the MaterialX Car Paint
3. Set the specular_anisotropy to 0.5
4. Set the coat (clear coat) parameter to be greater than 0

Expected

Anisotropy of base layer is still visible underneath the clear coat

Actual

Anisotropy of base disappears when coat parameter is greater than 0