Invalid updates of contentY of Flickable on touch screen

Flickable has a problem with updating of contentY while moving (no flicking) on touch screen with touch (mouse is OK). The problem is on Windows, I tested it with Qt 6.2.1 for Android and there it works fine. This must be a regression, because on Windows with Qt 5.15.0 the problem does not occur either.

I have attached a sample application showing the problem (test22.zip):

import QtQuick 2.15
import QtQuick.Controls 2.15

ApplicationWindow {
    width: 640
    height: 480
    visible: true
    title: qsTr("Scroll")

    Flickable {
        anchors.fill: parent
        contentWidth: width
        contentHeight: contentRect.height
        onContentYChanged: {
            console.debug("contentY", contentY)
        }

        Rectangle {
            id: contentRect

            width: parent.width
            height: 1000
            color: "grey"
            gradient: Gradient {
                GradientStop { position: 0.0; color: "lightsteelblue" }
                GradientStop { position: 1.0; color: "blue" }
            }
        }
    }
}

To reproduce the problem you have to touch the flickable somewhere in the middle and slowly move your finger towards the top of the window. You may then notice strange content jumping instead of moving smoothly. Some of the contentY values appear to be totally incorrect.

Below are the logs from the application:

1. For Qt 6.2.1 (incorrect - for moving from bottom to top there should not be any negative values):

   qml: contentY 0.5
   qml: contentY 1.5
   qml: contentY 2
   qml: contentY 2.5
   qml: contentY 3
   qml: contentY 4
   qml: contentY -105.5
   qml: contentY 6
   qml: contentY -103.5
   qml: contentY 8
   qml: contentY -102
   qml: contentY -101
   qml: contentY -100.5
   qml: contentY 11.5
   qml: contentY -97.5
   qml: contentY -95.5
   qml: contentY -94.5
   qml: contentY -92.5
   qml: contentY -91.5
   qml: contentY 20.5
   qml: contentY -88.5
   qml: contentY -87.5
   qml: contentY -87
   qml: contentY -85.5
   qml: contentY -85
   qml: contentY -83.5
   qml: contentY -82.5
   qml: contentY -81
   qml: contentY -80.5
   qml: contentY -79
   qml: contentY -78
   qml: contentY -77
   qml: contentY -76
   qml: contentY 35
   qml: contentY -75
   qml: contentY 36
   qml: contentY 36.5
   qml: contentY -73.5
   

1. For Qt 5.15.0 (correct):

   qml: contentY 2.5
   qml: contentY 4
   qml: contentY 5
   qml: contentY 6.5
   qml: contentY 7
   qml: contentY 8
   qml: contentY 9
   qml: contentY 10
   qml: contentY 11.5
   qml: contentY 12.5
   qml: contentY 13
   qml: contentY 14
   qml: contentY 15
   qml: contentY 16
   qml: contentY 17
   qml: contentY 17.5
   qml: contentY 19
   qml: contentY 20
   qml: contentY 20.5
   qml: contentY 21
   qml: contentY 22.5
   qml: contentY 24
   qml: contentY 25.5
   qml: contentY 27.5
   qml: contentY 28
   qml: contentY 29.5
   qml: contentY 31
   qml: contentY 32
   qml: contentY 33.5
   qml: contentY 35.5
   qml: contentY 36.5
   qml: contentY 38
   qml: contentY 39
   qml: contentY 39.5
   qml: contentY 40.5
   qml: contentY 41.5
   qml: contentY 42.5
   qml: contentY 45
   qml: contentY 47
   qml: contentY 49
   qml: contentY 49.5
   qml: contentY 52
   qml: contentY 53.5
   qml: contentY 54.5
   qml: contentY 55
   qml: contentY 56.5
   qml: contentY 58
   qml: contentY 59
   qml: contentY 59.5
   qml: contentY 60.5
   qml: contentY 61
   qml: contentY 62
   qml: contentY 62.5
   qml: contentY 63
   qml: contentY 64
   qml: contentY 64.5
   qml: contentY 64