Manually created this case for https://fogbugz.unity3d.com/f/cases/1409175/

Reproduction steps: 1. Open the attached 'My project' project 2. Open the 'scene' Scene 3. Observe the 'Placer with override' GameObject in the Inspector 4. Right-click on the 'Placer' property and 'Apply to Prefab 'Placer'' 5. Observe the Console Expected result: No errors are in the Console Actual result: Multiple 'ApplySingleProperty copy state error: SerializedProperty could not be found for placer.lineDirection.x' errors are in the Console Reproducible with: 2020.3.30f1, 2021.2.14f1, 2022.1.0b11, 2022.2.0a7 Could not test with: 2019.4.36f1 (due to compile errors)