Reproduction steps:
1. Open the attached project;
2. Open the scene "Scene 1";
3. Change the object "I want an icon" icon to some color;
4. Open the scene "Scene 2";
5. Return to the scene "Scene 1";

Actual result: when you go back to the "Scene 1", you can see that an icon does not save.
Expected result: the dialog window should show up which should ask if you want to save the scene. And then an icon should be saved.

Note: if you disable and enable the gameObject, the dialog window will show up and ask if you want to save the scene. An icon will be saved.

Reproduced with: 5.4.5p1, 5.5.3f1, 5.6.0f3, 2017.1.0b1

Verified with 2017.2.0a4