Simpler repro:
- open GameViewClickEvent.zip
- play the scene
- try to click on the cube or the button - both should log an incrementing number
- double clicking works
- changing the aspect ratio make it work by addind space between the window edge and the game view edge
- clicking on the upper part of objects (further from the bottom edge) works

Steps to reproduce:

1. Open attached project
2. Open and Play 'WheelColliderTest' scene
3. Try to click on the 'Reset Vehicle' button at the bottom right corner (it should re-instantiate the car object)
4. Notice that if you click the bottom part of the button, it does not react to the clicks (see attached gif)

Notes:
The button does change the color to highlighted one when hovering the mouse over it, just doesn't react to clicks properly.
Same with other UI elements (for example, clicking the input field in the bottom left corner won't focus on it as well)
On built player everything works as expected.

Not reproducible with: 5.3.5p4, 5.4.0b17