Hi, phil_ke
"Navigation.history.current.initialPlaceholder" is a kind of flag that is "true" when your app has been reactivated from suspension. This is used on base.js just to check if is necessary to "push" a history in the backStack. This mean that, if your
app has been newly launch, the navigator don't have a history. On the other hand, if your app has been reactivated from suspension, is necessary to consider this history to allow the user navigate back the pages.
