Steps to reproduce:
1. Create new Unity project
2. Make sure Editor theme is set to light
3. Create Cube GameObject
4. Drag Cube GameObject to Project window to create Prefab
5. Select Cube Prefab
6. Observe Prefab icon in the Project window
Actual results: The blue Prefab icon blends with the blue selection highlight of Prefab in Project window
Expected results: The selection highlight color or prefab icon color should contrast enough to ensure visibility
Reproducible with versions: 2022.3.63f1, 6000.0.50f1, 6000.1.5f1, 6000.2.0b4
Tested on (OS): macOS Silicon, Sequoia 15.5