To reproduce:
1. Open attached example project (Assets/scene.scene).
2. Select "Cube" game object in the hierarchy.
3. Notice the "Cube" game object is using a Diffuse shader that references "Assets/texture_green.png".
4. Select "Assets/texture_red.png"
5. Execute from the main menu "Assets > Find References in Scene"
6. Observe that the "Cube" game object is shown in the hierarchy, indicating it's using texture_red.png, even
so it does not use texture_red.png.