How to reproduce:
1. Open the attached “IN-132620_elipsis_warning” project
2. Open the “TestScene” Scene
3. In the Hierarchy window select the “Canvas → Ellipsis” GameObject
4. In the Inspector window set the Font Style to “Bold”
5. Set Overflow to “Ellipsis”
6. Navigate to Assets and reload the Domain by reimporting the “Empty” script
7. Observe the Console

Actual result: A warning is thrown, and the text Overflow is set to “Truncate”
Expected result: No warning is thrown, and the text Overflow stays as “Ellipsis”

Reproducible with: 6000.0.66f2, 6000.1.0a9 (0115cb901a32), 6000.3.7f1, 6000.4.0b7, 6000.5.0a6
Not reproducible with: 2023.1.0a1, 6000.1.0a8

Reproducible on: Windows 11, macOS 26.2 (M1) (by user)
Not reproducible on: No other environments tested