UI Document (UXML) UI disappears from the Game view when any asset is imported and does not reappear until clicking in the Editor

Steps to reproduce:

1. Create a new URP project
2. In the Hierarchy, right-click > UI Toolkit > Panel Renderer
3. Create a new UI Document and assign it to Panel Renderer
4. Open the UI Document in UI Builder
5. Add any visible element (e.g. Visual Element with texture assigned or a Button)
6. Open Game view to observe the element is visible
7. Import any file into the project (e.g. the attached "focus.svg")
8. Observe the Game view without clicking in the Editor

Actual results: UI elements immediately disappear from the Game view the moment the asset is imported, and the Game view stays blank until the user clicks somewhere in the Editor

Expected results: The UI elements should remain continuously visible in the Game view

Reproducible with versions: 6000.0.0f1, 6000.3.19f1, 6000.5.2f1, 6000.6.0b2, 6000.7.0a1

Tested on (OS): macOS 26.5

Notes:

• Also reproduces if asset is imported during Play mode
• Also reproduces with UI Document Component