Gameplay windows from Standalone do not remember their positions properly when there are multiple windows

The position of game windows from Standalone Game mode are not saved properly when multiple windows are used. The placement of the windows upon the next launch ends up placing all of the windows on the same spot, in a spot where one of the windows were previously.

Regression?: Yes
This did not occur in 4.20

1. Create a new project
2. In the PIE settings, change the number of players to 2 or more
3. Launch the game in Standalone Game mode
4. Move the windows to different locations
5. Quit the Standalone processes
6. Launch the game in Standalone Game mode again
   Result: Both windows are placed at the same location, instead of being where they were placed previously
   Expected: The windows are in their previous positions.