Reproduction steps:
1. Open the attached “IN-103315.zip” project
2. Double click on the “ShaderGraph” from the Project Window
3. In the Shader Graph Window observe the two expanded nodes (Custom Function and Channel Mixer)
4. Right-click anywhere in the Shader Graph Window
5. Select “Collapse all previews” (or click Ctrl+T)
6. Observe the Custom Function Node

Expected result: The Custom Function Node collapses
Actual result: The Custom Function Node does not collapse

Reproducible with: 6000.1.0b7, 6000.1.6f1, 6000.2.0b4
Not reproducible with: 2022.3.62f1, 6000.0.50f1, 6000.1.0b6

Reproducible on: macOS 15.4.1 (M1 Max), Windows 11
Not reproducible on: no other environment tested

Notes:
- If the Custom Function is collapsed on start, expand it by doing 4th step, but after that select “Expand All Previews”
- Arrow next to the Custom Function also does not seem to work when wanting to expand the Node