First person controller does not lock mouse to center of screen in OSX editor.

Repro steps:
1. Open Level_01 from attached project.
2. Select resolution 16:9 and set to Maximize on Play (works with all resolutions, but quite apparent at 16:9)
3. Press play.
4. In game press "B" and move mouse down to point camera at your feet.
5. Observe pink box position.

It's being positioned by a raycast from the mouse position: Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition), however the mouse position is clearly not centered on the screen (where the corsshair is).

6. Press "0" to restart level. That calls:

Cursor.lockState = CursorLockMode.None;
Cursor.visible = true;
SceneManager.LoadScene(0);

7. Look down again and observe that the pink box appears at the crosshair location (i.e. the mouse is this time centered appropriately).

Actual outcome: in OSX the mouse position does not initially get centered to the middle of the screen.

Expected outcome: mouse to be in center.

Notes:
- issue does not appear on Windows and in Stand alone Win/OSX players.
- not a regression, behavior appears in 5.3.0f4