maOS Style ScrollBar does not align with native macOS behavior

import QtQuick
import QtQuick.Controls.macOS

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    Rectangle {
        id: frame
        clip: true
        width: 160
        height: 160
        border.color: "black"
        anchors.centerIn: parent

        Text {
            id: content
            text: "ABC"
            font.pixelSize: 160
            y: -vbar.position * height
        }

        ScrollBar {
            id: vbar
            hoverEnabled: true
            active: hovered || pressed
            orientation: Qt.Vertical
            size: frame.height / content.height
            anchors.top: parent.top
            anchors.right: parent.right
            anchors.bottom: parent.bottom
        }
    }
}