Reg[6.5.3->6.6]ScrollView scrolling speed/sensitivity is reduced

import QtQuick 2.15
import QtQuick.Controls 2.15

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: "Scrollbar Scroll Speed Example"

    ScrollView {
        width: parent.width
        height: parent.height

        ListView {
            width: parent.width
            model: 100 // Just for demonstration
            highlightMoveDuration:8000
            highlightMoveVelocity  :200
            delegate: Item {
                width: parent.width
                height: 50
                Text {
                    anchors.centerIn: parent
                    text: "Item " + index
                }
            }
        }

        ScrollBar.vertical: ScrollBar {
            id: scrollbar
            width: 12
            height: parent.height
            policy: ScrollBar.AlwaysOn

            stepSize: 100 // Adjust this value to increase scroll speed

            background: Rectangle {
                color: "#dddddd"
            }

            Rectangle {
                color: "#aaaaaa"
                width: parent.width
                height: Math.max((parent.height / parent.contentHeight) * parent.height, 20)
            }
        }
    }
}