NullReferenceException error is thrown when adding the OverlayContainer or ToolbarOverlayContainer Element to the Hierarchy in UI Builder

Steps to reproduce:

1. Open any Project
2. Create a UI Document Asset in the Project Browser and open it
3. In the Library choose "Project"
4. Add OverlayContainer or ToolbarOverlayContainer to the Hierarchy (from UxmlSerializedData > UnityEditor > Overlays)

Actual results: Error "NullReferenceException: Object reference not set to an instance of an object

UnityEditor.Overlays.OverlayContainer+UxmlSerializedData.Deserialize (System.Object obj) (at <020c0befcaf54273ae8e5ac79216d210>:0)"

logged in Console when the Overlay Container is added to the UI Docs Hierarchy

Artifacting happens when Further adding anything to the Hierarchy and other errors are logged

Expected results: No issues with Elements

Reproducible with versions: 2023.3.0a15, 6000.0.42f1, 6000.1.0b10, 6000.2.0a6

Not reproducible with versions: 2022.3.60f1, 2023.3.0a14

Tested on (OS): Windows 11