Reproduction steps:
1. Open the attached “Shader Graph Udemy 06.zip“ project
2. Open “SampleScene” scene
3. Open “Zombunny” Shader Graph Asset Editor
4. Observe Main Preview window in Shader Graph Editor
Expected result: Main Preview window shows a sphere
Actual result: Main Preview window is blank
Reproducible with: 12.1.10 (2021.3.18f1, 2021.3.20f1), 14.0.6 (2022.2.9f1), 15.0.4 (2023.1.0b7), 16.0.0 (2023.2.0a5)
Not reproducible with: 10.10.1 (2020.3.46f1), 12.1.9 (2021.3.17f1)
Reproduced on: macOS Monterey 12.6 (Intel), Windows 10
Note: Downgrading to not reproducible version and then upgrading fixes the issue