How to reproduce:
1. Open attached Unity project "BugExample2"
2. Load "MainScene" scene
3. Enter the play mode
4. Press "Button" button several times

Expected Result: White object in the top left corner clones as much times as button is pressed. This object is visible.
Actual Result: Object clones after pressing this button, but all cloned objects are invisible in the UI. They are visible only in the Canvas-->Parent in Hierarchy window.

Workarounds:

• In the play mode disable and enable Canvas-->Parent object.
• Uncomment lines 12, 13 in the TestScript.cs script.

Regression first introduced in: 2017.2.0a1
Reproducible with: 2017.2.0b3, 2017.2.0a1
Not reproducible with: 2017.1.0f3, 5.6.2p4, 5.5.4p2