Game view does not scale correctly and a black void appears, which covers the rest of Game view when multiple Game views are open in the editor

Steps to Reproduce
1. Create a new project
2. Hierarchy > Create > Cube (Or any primitive)
2. Add multiple Game views in the editor
3. Resize one of the Game View

Actual Result:
Black void appear and Cube squishes on resizing Game view

Expected Result:
Game view is resized correctly without any black void.

Reproducible on:
2019.1.0a12, 2018.3.0f2, 2018.2.0f3, 2018.2.0a1

Not Reproducible on:
2018.1.0f2 , 2017.3.0f3

Environment:
Occurs Only on MacOS