How to reproduce:
1. Open the “IN-111511_AddBlendShapeFrame“ project
2. Open the “SampleScene”
3. Enter Play Mode
4. In the Hierarchy select the “TestMeshObject”
5. In the Inspector expand the “Skinned Mesh Renderer” Component
6. In the “Selector” Component ensure “Selection” is set to “None”
7. In “BlendShapes” set “NaN BlendShape” value above 0
8. Observe the cube color in Game view

Expected result: The cube is black
Actual result: The cube is white

Reproducible with: 2023.1.0a1, 6000.0.56f1, 6000.2.1f1, 6000.3.0a5

Reproducible on: macOS 15.6 (M1 Max)
Not reproducible on: no other environments tested