How to reproduce:
1. Create a new Unity project
2. In the Project window, right-click -> Create -> Shader Graph -> Any Shader Graph
3. Observe the connection point of the "Fragment" block
Expected results: The "bubble" of connection is empty inside
Actual results: There are some borders visible inside the "bubble"
Reproducible with: 6000.0.48f1, 6000.1.0f1, 6000.2.0a10
Reproducible on: Windows 11 Pro
Not reproducible on: No other environment tested