"Assertion failed on expression: 'GetPropertyPath().empty()'" is thrown when creating a template in UI Builder from an element selected in the integrated Hierarchy

Steps to reproduce:

1. Create a new 3D URP project
2. In Project Settings > UI Toolkit, enable "Enable Hierarchy Integration"
3. In Preferences > General, enable "Use new Hierarchy window"
4. In the Hierarchy, right-click > UI Toolkit > Panel Renderer or UI Toolkit > UI Document
5. Click New to create .uxml file and open it
6. Add any element to the UI Builder Hierarchy (e.g. Button)
7. In the Editor Hierarchy, expand the PanelRenderer or UI Document GameObject and select the added element (Button)
8. In UI Builder, right-click on the element (Button) and select "Create Template"
9. Save it and observe the Console

Actual results: "Assertion failed on expression: 'GetPropertyPath().empty()'
UnityEditor.RetainedMode:UpdateSchedulers ()" error is thrown 

Expected results: No errors are thrown

Reproducible with versions: 6000.5.0a7, 6000.5.0b9, 6000.6.0a5

Not reproducible with versions: 6000.4.81, 6000.5.0a6

Tested on (OS): Windows 11

Notes: Sometimes does not reproduce if the Scene is saved after creating Panel Renderer or UI Document GameObject