Two Sub Scenes are displayed under Editor World after toggling "Auto Load Scene" on a closed and reopened Sub Scene

Steps to reproduce:

1. Create a new 3D URP project
2. Make sure "Use new Hierarchy window" is enabled in Preferences > General
3. Install Entities package (com.unity.entities)
4. In the Hierarchy, right-click > New Sub Scene > Empty Scene and save it
5. Select it In Hierarchy and click "Close" on the Sub Scene Component in the Inspector
6. Click "Open"
7. Uncheck "Auto Load Scene"
8. Check again "Auto Load Scene"
9. Observe the GameObjects under Editor World

Actual results: Two Sub Scenes are visible under Editor World

Expected results: One Sub Scene is visible under Editor World

Reproducible with versions: 6000.5.0a8, 6000.5.0b10, 6000.6.0a6

Can’t test with versions: 6000.3.16f1, 6000.4.9f1 (different Hierarchy structure)

Tested on (OS): Ubuntu 24.04, macOS 26.4

Notes:

• Closing and reopening Hierarchy or resetting the Layout/entering Play mode - removes the additional Sub Scene