Mouse is locked to viewport on PIE regardless of Game Gets Mouse Control property

The mouse is being locked to the viewport when you PIE. The toggle Game Gets Mouse Control (Editor Preferences/Play) does not appear to be working. It seems to always be on. With it off I would expect the user to have to click inside the viewport to give it focus.

Regression: Yes this option worked in 4.10.4

1. Open a new blank project
2. In the Editor Preferences/Level Editor/Play
   1. Turn off Game Gets Mouse Control
3. PIE

Result: Mouse is locked in the viewport
Expected: Viewport to not even have focus and the mouse free to move anywhere

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