How to reproduce:
1. Open the attached "UIShaderGraph" project
2. Open the "Test" ShaderGraph
3. Right-click on the "Main Preview"
4. Observe the contextual menu
Expected results: All options in the contextual menu are disabled because UI Shader uses the specific preview type
Actual results: All options are available but clicking on them has no result
Reproducible with: 6000.3.12f1, 6000.4.2f1, 6000.5.0b2, 6000.6.0a3
Can't test with: 6000.0.71f1 (No such feature)
Reproducible on: macOS Tahoe 26 (M1)
Not reproducible on: No other environment tested