Unity version used: Version 2020.1.0a2 (4e42ad0657ba)
SRP version used: 7.0.1 and 7.1.1 (747a0930f2)

Repro steps:
1. Use a project with Universal RP package
2. Create a Universal Pipeline Asset
3. Create a 2D Renderer Data Asset
4. Select the Universal Pipeline Asset and set the Renderer Type to "Custom" and plug in your 2D Renderer Data Asset
5. Create a Shader -> 2D Renderer -> Lit Sprite Graph
6. Open it
Expected result: the shadergraph preview would be lit so you can see what it looks like
Actual result: the shadergraph preview is pure black with no way to see what the surface looks like aside from saving and viewing it in the scene with a 2D light