Steps to reproduce:
1. Create new Unity project
2. Import TMP Essentials from “TMP Importer” window
3. Go to Assets > TextMeshPro > Fonts
4. Right-click on LiberationSans.ttf Asset
5. Create TextMeshPro SDF Font Asset (Create > TextMeshPro > Font Asset > SDF)
6. Select created LiberationSans SDF.asset in Project window
7. In Inspector window go to Debug mode
Actual results: “The same field name is serialized multiple times in the class or its parent class. This is not supported: Base(MonoBehaviour) m_EntityId” error is thrown in the Console window
Expected results: No errors are thrown in the Console window
Reproducible with versions: 6000.4.0b4 (363fa9eb2d30), 6000.4.0f1, 6000.5.0a9, 6000.6.0a1
Not reproducible with versions: 6000.3.11f1, 6000.4.0b3 (6a102f65a170)
Tested on (OS): macOS Silicon Tahoe 26.3.1 (M1), Ubuntu 24.04