Reproduction steps:
1. Open the attached “BugRepro” project
2. Open the “Assets/Scenes/2D Shader Studies.unity” Scene
3. Enter the Play Mode
4. Exit the Play Mode
5. Observe the view
Expected result: ShaderGraph sprite stays the same
Actual result: ShaderGraph sprite is replaced by a blue box
Reproducible with: 2023.1.0a11, 6000.0.13f1
Not reproducible with: 2022.3.40f1, 2023.1.0a10
Couldn't test with: 2021.3.40f1 (there is no ShaderGraph material)
Reproducible on: Windows 11
Not reproducible on: No other environment tested
Note: Sprite shows up again when reimporting the ShaderGraph material or opening ShaderGraph and saving it