Deleting a Visual Element in UI Builder throws ObjectDisposedException if it had Data Source Type assigned

Steps to reproduce:

1. Open the attached project
2. Open the test.UXML asset
3. Select VisualElement in the UI Builder's Hierarchy
4. In the Inspector window, set Data Source Type
5. Delete the VisualElement
6. Observe the Console window

Actual results: ObjectDisposedException: SerializedProperty m_VisualElementAssets.Array.data[1].m_SerializedData.dataSourceTypeString has disappeared! error is thrown

Expected results: No errors or warnings are thrown after deleting an element

Reproducible with versions: 6000.2.0b1, 6000.2.15f1, 6000.3.1f1, 6000.4.0b1, 6000.5.0a2

Not reproducible with versions: 6000.0.64f1, 6000.2.0a10

Tested on (OS): Ubuntu 24.04, macOS 26.1