QML: "Title bar" artifact when using Window.showMinimized()

import QtQuick
import QtQuick.Window

Window {
    id: technical_window
    flags: Qt.Window | Qt.FramelessWindowHint | Qt.CustomizeWindowHint

    visible: true
    width: 640
    height: 480

    title: "window"

    color: "transparent"

    Rectangle {
        anchors.fill: parent
        color: "transparent"
        border.color: "red"
        border.width: 1
    }

    Rectangle {
        width: 100
        height: 100
        color: "green"
        anchors.centerIn: parent

        Text {
            text: "minimize"
            anchors.centerIn: parent
        }

        MouseArea {
            anchors.fill: parent

            onPressed: {
                technical_window.showMinimized()
            }
        }
    }
}

import sys

from PySide6.QtCore import QUrl
from PySide6.QtGui import QGuiApplication
from PySide6.QtQml import QQmlApplicationEngine
from PySide6.QtQuickControls2 import QQuickStyle

if __name__ == "__main__":
    app = QGuiApplication(sys.argv)
    QQuickStyle.setStyle("Basic")
    engine = QQmlApplicationEngine()
    engine.load(QUrl("main.qml"))

    if not engine.rootObjects():
        sys.exit(-1)

    sys.exit(app.exec())