Reproduction steps:
1. Open the attached project;
2. Click on the prefab "Test Object" and drag it into Hierarchy window;
3. Observe the color of the instance name in the Hierarchy window;

Actual result: the color of the instance name is grey.
Expected result: the color of the instance name should be blue.

Note: this behaviour is happening because the prefab has the missing script. If you add the script to the prefab and instantiate it, the color of name will be blue.

Reproduced with: 5.3.7p4, 5.4.1f1, 5.5.1f1, 5.6.0b10