Closing HDR Color window after selecting a colour with Colour Picker closes HDR Gradient Editor (linear) window as well

Steps to reproduce:
1. Create a new project
2. Install Visual Effect Graph package (Window > Package Management > Package Manager)
3. Create Visual Effect Graph (Create > Visual Effects > Visual Effect Graph)
4. Select any of the default Graphs (ex. Simple Loop)
5. Select Color field to open HDR Gradient Editor (linear) window
6. Select one of the gradient markers and press on HDR Color field to open HDR Color window
7. Press on color picker icon in the newly opened window and select any colour in the Editor
8. Close HDR Color window and observe

Actual results: HDR Color window is closed
Expected results: HDR Color and HDR Gradient Editor (linear) windows are closed

Reproducible with versions: 2021.3.52f1, 2022.3.62f1, 6000.0.49f1, 6000.1.4f1, 6000.2.0b2
Tested on (OS): macOS Sequoia 15.3 (M4)