If using two canvases one with Canvas Scaler mode set to Constant Pixel Size and other Scale with Screen Size. Setting canvas with Scale with Screen Size as a child of a Constant Pixel Size, the child canvas doesn't retain its scale.

Steps to reproduce:
1. Download project and open "HomeScreen" scene
2. Enter play mode (script automatically sets canvas as child)

Expected results: child canvas retains it scale
Actual results: child doesn't canvas retains it scale

Reproduced with: 2017.2.a1 - 2017.2.0f3, 2017.3.0a1 - 2017.3.0b4
Fixed in: 2017.2.0p1, 2017.3.0b5