UI Toolkit Debugger's Dynamic Atlas Viewer window throws a window serialization error if Live Reload is enabled

Steps to reproduce:

1. Create a new project
2. Open the UI Toolkit Debugger window (Window -> UI Toolkit -> Debugger)
3. Select any window as the debugger's target
4. Press the Texture Atlas Viewer button to open its window
5. Right-click on the Texture Atlas Viewer window handle
6. Select the UI Toolkit Live Reload option
7. Observe the Console window

Actual results: A window serialisation error is thrown every time Live Reload is enabled or disabled

Expected results: No warnings or errors are thrown when enabling UI Toolkit Live Reload

Reproducible with versions: 6000.0.82f1, 6000.3.23f1, 6000.5.10f1, 6000.6.0b10, 6000.7.0a5

Tested on (OS): macOS 26.6.2, Ubuntu 24

Full error message:

• Window serialization will fail for UnityEditor.UIElements.Debugger.TextureAtlasViewerWindow, will not reload it. Make sure that there are no compile errors and that the file name and class name match.
  UnityEditor.RetainedMode:UpdateSchedulers () (at /Users/bokken/build/output/unity/unity/Modules/UIElementsEditor/RetainedMode.cs:68)