Reproduction steps:
1. Create a new project
2. Import a Vector Image Asset and  create UI Document (Create > UI Toolkit > UI Document)
3. Double-click UI Document to UI Builder window and drag and drop VisualElement to UI Builder Hierarchy
4. Change Background Image type to “Vector” and select imported Vector Image Asset
5. Change the Vector Image Asset type to “Texture2D” in the Inspector and click “Apply” button
6. Change the Asset type back to “UI Toolkit Vector Image” and click “Apply” button again
7. Observe the UI Builder

Actual result: Vector Image Asset icon disappears and the {}“{}Select Vector Image” window shows “None” as the selected option
Expected result: Same option is selected and displayed in both Image field and “Select Vector Image” window

Reproducible with:  2023.3.0a2, 6000.0.72f1, 6000.3.13f1, 6000.4.3f1, 6000.5.0b4, 6000.6.0a2

Reproduced on: macOS Tahoe 26.3 (M4)