How to reproduce:
1. Create a new URP Unity Project
2. Go to Window -> Package Manager -> Shader Graph -> Samples -> Node Reference -> Import
3. In the Project window, go to Assets -> Samples -> Shader Graph -> 17.0.3 -> Node Reference -> Math -> Absolute
4. Make sure the previews on Nodes "Sine" and "Absolute" are expanded
5. In the Graph Inspector, open any dropdown
6. Wait for a couple of seconds and close dropdown
7. Observe the previews

Expected results: The previews were playing while the dropdown was opened or were stopped completely 
Actual results: The preview suddenly changes because the preview was stopped but it was still simulated in the background

Reproducible with: 2021.3.44f1, 2022.3.49f1, 6000.0.23f1

Reproducible on: macOS Sequoia 15.0 (M1)
Not reproducible on: No other environment tested