UI Toolkit Debugger window selection changes when the selected window is undocked/docked in a different position for the first time on a new project

Steps to reproduce:

1. Create a new Unity project using the Universal 3D template
2. Click the burger icon in the Hierarchy window and select UI Toolkit Debugger
3. Dock the UI Toolkit Debugger window
4. Press the "Pick Element" button in the UI Toolkit Debugger window and select the Hierarchy window
5. Undock/dock in a different position the Hierarchy window
6. Observe the UI Toolkit Debugger window

Actual results: The selected window changes in the UI Toolkit Debugger

Expected results: The selected window remains the same in the UI Toolkit Debugger

Reproducible with versions: 6000.0.57f1, 6000.2.3f1, 6000.3.0a5, 6000.3.0a6

Can’t test with versions: 6000.0.56f1, 6000.2.2f1, 6000.3.0a4 (due to different behavior ([Internal link]))

Tested on (OS): macOS Silicon Sequoia 15.6

Notes:

• Reproduces only first time on a new project, stops reproducing after first reproduction