How to reproduce:
1. Open the attached project "PublicRefBug.zip"
2. Open Scene "SampleScenes" (Assets/Scenes)
3. Select the "AUDIO" GameObject
4. Click on the circular selection symbol right from the "Audio Clip" in the "Audiotest" Script Component in the Inspector
5. Select the "onlymp3.to" mp3 file
6. Repeat step 4 and select "None"
Expected result: Public reference switches to "None"
Actual result: The public reference switches to "None", but visually it stays the same
Reproducible with: 2022.2.0a17, 2022.2.0b8, 2023.1.0a12
Not reproducible with: 2020.3.40f1, 2021.3.10f1, 2022.1.17f1, 2022.2.0a16
Reproduced on: macOS (12.5)