Steps to reproduce:
1. Create a project
2. Create > Visual Effects > Visual Effect Graph
3. Open newly created VFX Asset
4. Select any of the default templates
5. Select Color gradient field to open HDR gradient Editor (linear) window
6. Add new markers to the gradient by clicking below the gradient
7. Remove marker by dragging it down and move the mouse around without releasing the mouse button
8. Release mouse button and observe the HDR gradient Editor (linear) window
Actual results: Color and Location fields disappear
Expected results: Nothing of note happens
Reproducible with versions: 2021.3.50f1, 2022.3.61f1, 6000.0.46f1, 6000.1.0b14, 6000.2.0a8
Tested on (OS): macOS Sequoia 15.3.1 (Intel)
Note: Color and Location fields reappear after clicking few times on the HDR gradient Editor (linear) window