Reproduction steps:
1. Open the attached “IN-121561.zip” project
2. Open the “ReproScene” scene
3. From the Hierarchy, select the “Prefab” GameObject
4. In the Inspector, expand the “Data” property and its elements
5. Reorder the elements by dragging either one of them to a different position
6. Right-click (or click three dots) on the “Component (Script)”
7. Select “Modified Component” > “Apply to Prefab ‘Prefab’”
8. Observe the elements under “Data”

Expected result: UnityEvent values are retained, and the prefab is saved with the new values
Actual result: UnityEvent values are reset to null and saved as such in the prefab

Reproducible with: 2023.1.0b1, 6000.0.60f1, 6000.2.8f1, 6000.3.0b7, 6000.4.0a3

Reproducible on: Windows 11
Not reproducible on: No other environment tested

Note:
- The issue does not occur when applying overrides from the Overrides dropdown