*Steps to reproduce:*
# Open the attached project
# Open the Test UI Document
# Add a Button
# Add a VisualElement
# Add a Label nested inside VisualElement
# Undo Label Creation
# Undo VisualElement Creation
# Redo VisualElement Creation
# Redo Label Creation

*Actual results:* "Invalid UXML or USS: System.IndexOutOfRangeException: Index was outside the bounds of the array" error is thrown. The opened document becomes corrupted, preventing any changes

*Expected results:* Performing Undo/Redo operations does not result in thrown errors or data loss

*Reproducible with versions:* 2022.3.63f1, 6000.0.51f1, 6000.1.7f1, 6000.2.0b5

*Tested on (OS):* macOS 15.5

*Notes:*
* If the Test UI Document is reopened after the reproduction steps, it can be seen that any unsaved changes before the issue occurs are lost - Button from Step 3 is missing