GameObject's scale is set to 0. It's child canvas scale is set to 5x5. When checking whether a clicked point is within the canvas, it still registers when within the current 5x5 square in the middle.

Steps to reproduce:
1. Download and open the project
2. Enter Playmode
3. Click in the general center of the Game view

Expected result: clicked point is not registered, because canvas has no size
Actual result: point is still considered within the canvas

Reproduced on 5.4.5p1, 5.5.4f1, 5.6.1p3, 2017.1.0b10, 2017.2.0b1