How to reproduce:
1. Open the attached "IN-101580" project
2. Open the "UIDocument.uxml" in UI Builder
3. In UI Builder, select the "VisualElement" in the Hierarchy
4. In the Inspector, under the Attributes category, edit any field
5. Observe the "UIDocument.uxml" name in the Hierarchy

Expected result: File is marked dirty
Actual result: File is not marked dirty

Reproducible in: 2022.1.0a8, 2022.3.62f1, 6000.0.49f1, 6000.1.3f1, 6000.2.0b1
Not reproducible in: 2022.1.0a7

Reproduced on: Windows 11 Pro (24H2)
Not reproduced on: No other environment tested

Notes:
- Editing fields under StyleSheet or Inlined Styles categories marks the UXML file as dirty
- Undoing any Inspector change marks the USS and UXML files as dirty
- This is just a visual problem. When closing UI Builder, the prompt to save changes is still shown