How to reproduce:
1. Create a new URP project
2. Import the Procedural Patterns samples from the Shader Graph package into the project
3. In the project window, go to Assets -> Samples -> Shader Graph -> [version] -> Procedural Patterns
4. Open the "Bacteria Smoothstep" Shader Graph
5. Observe the Preview
Expected results: The preview Shader is not solid black
Actual results: The preview Shader is black
Reproducible with: 2021.3.40f1, 2022.3.38f1, 6000.0.11f1
Reproducible on: macOS 14.5 Sonoma (M1)
Not reproducible on: No other environment tested
Note: Creating a Material with this Shader Graph and using in on the Game Object results in the same black output