UI Toolkit Debugger's Dynamic Atlas Viewer window does not display an atlas after it was Maximized

Steps to reproduce:

1. Create a new project
2. Open the UI Toolkit Debugger window (Window -> UI Toolkit -> Debugger)
3. Select the Inspector window as the debugger's target
4. Press the Texture Atlas Viewer button to open its window and dock it
5. Switch the Debugger's target to SceneView (Or any other window that has an Atlas)
6. Observe that the Atlas is displayed as expected
7. Switch the Debugger's target back to Inspector
8. Maximise the Dynamic Atlas Viewer window
9. Exit the Maximised state for the Dynamic Atlas Viewer window
10. Switch the Debugger's target to SceneView (Or any other window that has an Atlas)

Actual results: Atlas viewer window is not updated and states that there's no atlas to display

Expected results: Atlas viewer window is updated and shows the same results as in Step 5

 

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

Notes:

• Step 7 isn't strictly necessary. Entering Maximised mode will discard any shown Atlas and the window will enter the same state