[REG] StackView.initialitem is not equivalent to push() in Component.onCompleted

This is a regression compared to Controls 1. In Controls 2, StackView.initialitem is not equivalent to Component.onCompleted: stackView.push(myInitialItem).

from the documentation:

InitialItem : var
This property holds the initial item that should be shown when the StackView is created. The initial item can be an Item, Component, or a url. Specifying an initial item is equivalent to:

Component.onCompleted: stackView.push(myInitialItem)