Reproduction steps:
1. Open the attached “UnityEventsSerializationBug” project
2. In the Project window, select “Assets/TestUnityEvents/UnityEventTest_CustomInheritedMembers” or “Assets/TestUnityEvents/UnityEventTest_UnityInheritedMembers” Prefabs
3. In the Inspector window, collapse the “Test Unity Events” script
4. Expand the collapsed script
Expected result: UnityEvent listeners remain unchanged
Actual result: All UnityEvent listeners that are inherited class members are unassigned
Reproducible with: 6000.0.50f1, 6000.0.53f1
Not reproducible with: 2021.3.53f1, 2022.3.64f1, 6000.0.49f1, 6000.1.11f1, 6000.2.0b9
Reproducible on: macOS Sequoia 15.5 (M1 Max), Windows 11
Not reproducible on: No other environments tested