PIE with single process starts multiple server windows

Playing in editor with single process starts multiple server windows.

1. Open any project into UE4Editor
2. Select Play drop down > Advanced Settings
3. Set the following Multiplayer Options:
   • Play Net Mode = Play As Listen Server
   • Run Under One Process = True
   • Play Number Of Clients = 3
4. Play in Selected Viewport

RESULT:
The new editor windows both have the NetMode Server title