Reproduction steps:
1. Create and open a new “3D” project
2. Make sure you’re in an “Untitled” Scene
3. Open a new window (e.g. Window > Rendering > Lighting)
4. Drag that window into a docking area so it creates a preview
5. While preview is displayed save the Scene by pressing the save shortcut (e.g. Ctrl+S)
6. Close the saving location dialog
7. Observe the dragged window
Actual result: Window remains floating and gets stuck (displayed above all other applications)
Expected result: Window is docked
Reproducible with: 6000.0.1f1, 6000.0.80f1, 6000.3.21f1, 6000.5.6f1, 6000.6.0b5, 6000.7.0a3
Reproducible on: Windows 11, Ubuntu 24.04.4, Ubuntu 26.04 (user)
Not reproducible on: No other environments tested