Reproduction steps:
1. Open the attached “IN-94413” project
2. In the Project window, double-click on "Assets/Materials/barrier_material.mat" to open it in the Shader Graph Editor
3. Select any other material in the Project window and drag it into the Blackboard
4. Hover over Power, Speed, Color icons
5. Observe the Console window

Expected result: No errors are thrown
Actual result: “ArgumentNullException: Value cannot be null.” errors are thrown

Reproducible with: 2022.3.57f1, 6000.0.37f1, 6000.1.0b5

Reproducible on: Windows 11
Not reproducible on: No other environment tested