USD displayColors displayed inconsistency in viewport 2.0

Hi,

When exporting USD data with the display Colors flag enabled, the colors aren't displayed the same (too bright).

**Steps to reproduce**
Steps to reproduce the behavior:
1. As maya Data assign material and modify the diffuse color to what you want.
2. File->Export USD -> enable display Color Flag
3. Create stage and load exported USD file.

**Expected behavior**
Correctly displayed colors.

**Attachments**

It seems the colors itself are storred correctly (viewed as flat).


As viewed in Houdini seems correct.

[usdDisplayColors.zip](https://github.com/user-attachments/files/18318955/usdDisplayColors.zip)

If applicable, add screenshots, sample files, etc to help explain your problem.

**Specs (if applicable):**
- Windows 11
- Maya version. Maya 2025.3
- Maya USD 0.30.0

Thanks for help.

- Tom