property initialization order incorrect

Let's assume we want to use the Button component in an application as:

Button.qml:
Item {
    property string text: "A"
 
    Component.onCompleted: {
        console.log( "Button::onCompleted " + text )
    }
}
 
MyApp.qml:
Window {
    Button {
        text: "B"
    }
}

This prints out "B" as expected. But when I change the property initialization in button.qml to

property string text: {"A"} // or
property string text: getInitialValue() // which returns "A"

Expected initial value is "B" in all cases. This is very concrete example in QML components when the initial value is fetched from platform theme or from localization data.