Behavior on ListView does not work right away if you try and use it with Component.onCompleted

import QtQuick 2.0

Item {
    width: 300
    height: 600
    property bool listToggle: true
    
    // Make list animate right away, except the Behavior does not seem to exist yet.
    Component.onCompleted: {
        list.y = 0;
    }

    ListView {
        id: list
        y: 600
 
        Behavior on y {
            NumberAnimation { duration: 3000}
        }

        width: 300
        height: 600
        model: 100

        delegate: Rectangle {
            width: 300
            height: 100
            color: index % 2 ? "grey" : "lightgrey"
        }
    }
    
    // Test to see if Behavior works later, which it does
    MouseArea {
        anchors.fill: parent
        onClicked: {
            listToggle ? list.y = 600 : list.y = 0;
            listToggle = !listToggle;
        }
    }

}