-error: the lilltle popout window to selectivly apply prefab overrides just vanishes when clicking into it
--works well on Windows editor

-repro:
--open attached project
--open test2 scene
--select the "A" prefab
--in the inspector click Overrides
--select the "B" entry in the window
--try changing click "Apply" in the popout window (or any other control/button)
--NOTICE that the little window just vanishes