Errors are thrown when “Custom Lighting” Shader Graph Sample is imported

Steps to reproduce:

1. Create a new Unity using the Universal 3D template
2. Open the Package Manager (Window > Package Management > Package Manager)
3. Select the Shader Graph package
4. Open the Samples tab
5. Import the "Custom Lighting" Sample
6. Observe the Console window

Actual results: "Concretization: Slot Input cannot accept input of type Vector3.", "NullReferenceException: Object reference not set to an instance of an object" errors are thrown

Expected results: No errors are thrown

Reproducible with versions: 6000.5.0b8, 6000.5.0b9, 6000.6.0a5

Not reproducible with versions: 6000.3.16f1, 6000.4.8f1, 6000.5.0b7

Can’t test with versions: 6000.0.75f1 (due to no Custom Lighting Sample)

Tested on (OS): MacOS Silicon Tahoe 26.3, Ubuntu 24.04