Opened focused GameView doesn't receive input.

When a second GameView is opened, sometimes it doesn't receive keyboard input.
How to reproduce:
1. Open and run scene.unity
2. Press Space — a new GameView window will open
3. Press Space again — if the window closes goto [2] (usually breaks on the second attempt)
4. If the window doesn't close, observe that the log in the top left corner says False for any key pressed — at this point the input is lost