How to reproduce:
1. Open the attached “IN-12231” project
2. Open the “Prefab Image” from Project Browser in a Prefab View
3. Set the “SecondImage” to the missing “Source Image” field in the Inspector
4. Save and re-open the Prefab
Expect result: “Source Image” field is “SecondImage”
Actual result: “Source Image” field is “Missing (Sprite)”
Reproducible with: 2022.2.0a13, 2022.2.0b6, 2023.1.0a8
Not reproducible with: 2020.3.38f1, 2021.3.8f1, 2022.1.14f1, 2022.2.0a12
Reproduced on: macOS 12.3 (Intel)