I noticed that the application can freeze, especially when the user is on the login screen (WinKey + L for quick access there) After returning from this screen, the application interface is frozen. Not always but often, I also noticed that this has some connection to the x/y coordinates when creating the notification window. If I set them somewhere off-screen, it freezes much more frequently after returning from the lock screen

I've prepared a minimalistic code fragment that frequently triggers the mentioned problem. On my laptop it's enough to go to the lock screen (WinKey + L) 2-3 times to freeze the UI. On much stronger PC its way more difficult to reproduce it at least for me.

import QtQuick

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

  Rectangle {
    id: animatedRect
    anchors.centerIn: parent
    width: 100; height: 100
    color: "#00FF00"

    NumberAnimation {
      target: animatedRect
      properties: "rotation"
      from: 0; to: 360
      running: true
      duration: 500
      loops: Animation.Infinite
    }
  }

  Timer {
    interval: 2000
    repeat: true
    running: true
    onTriggered: {
      repeater.model = 0
      repeater.model = 9
    }
  }

  Repeater {
    id: repeater
    model: 0
    delegate: Loader {
      sourceComponent: Window {
        x: (Screen.desktopAvailableWidth - 100) + index * 20
        y: (Screen.desktopAvailableHeight - 100) + index * 20
        flags: Qt.Window | Qt.Tool | Qt.FramelessWindowHint | Qt.WindowStaysOnTopHint
        visible: true
        Component.onCompleted: raise()

        Rectangle {
          anchors.fill: parent
          color: "#FFCCCC"
          border.color: "#000000"
          border.width: 2
        }
      }
    }
  }
}

I'm using Qt 6.9.2, on 6.8 this problem doesnt exist for some reason. Perhaps instead of using Repeater/Loader/Window and ListModel, I should dynamically load the component through Qt.createComponent. However, I would first like to understand why my method causes such problems and, if necessary, report a bug.

Does anyone have any ideas?