Reproduction steps:
1. Create a new project
2. Create a Standard Element that has Text property (e.g. GameObject > UI Toolkit > Standard Elements > Label) and save UXML file
3. Select the Standard Element in the Hierarchy and paste “𖤓” into the Text field in the Inspector
4. Observe Element in the Viewport
5. Select any Font in the Text Font field in the Inspector
6. Select "None" in the Text Font field again
7. Observe Element in the Viewport
Actual result: Character remains rendered as an empty rectangle
Expected result: Character is rendered back as it was before selecting the Font
Reproducible with: 6000.6.0a7, 6000.6.0b9, 6000.7.0a5
Couldn’t reproduce with: 6000.0.82f1, 6000.3.22f1, 6000.5.9f1, 6000.6.0a6 (No Standard Elements option)
Reproduced on: Ubuntu 24.04, macOS Tahoe 26.5 (M4)
Note: Issue is not reproducible in UI Builder