Unstable lighting when additional light sources are added in Shader Graph nodes

Reproduction steps:
1. Create a new 3D (URP) project
2. Right-click on empty space in the Project window
3. Select “Import Package / Custom Package” option
4. Select the attached “bugrepro.unitypackage” Package
5. Open the “Scenes/SampleScene” Scene
6. Observe the “Sphere” GameObject in the Scene View

Expected result: The GameObject’s surface is lit by 2 different lights
Actual result: The GameObject’s surface is unlit and sometimes flickers

Reproducible with: 2023.3.0a2, 6000.0.21f1
Not reproducible with: 2021.3.44f1, 2022.3.47f1, 2023.2.0a23

Reproducible on: Windows 10
Not reproducible on: No other environment tested

Note:

• Reproduction may be inconsistent. While upgrading from 2022.3 to Unity 6, the issue did not reproduce. Each time, a new project was created and the package imported anew for the issue to be visible