Issue using popupType property on linux

import QtQuick
import QtQuick.Controls

Window {
    width: 320
    height: 240
    visible: true
    title: qsTr("Hello World")

    Column {
        spacing: 8
        anchors.centerIn: parent

        Button {
            anchors.horizontalCenter: parent.horizontalCenter
            text: qsTr("Open Popup Item")
            onClicked: popupItem.open()
        }
        Button {
            anchors.horizontalCenter: parent.horizontalCenter
            text: qsTr("Open Popup Window")
            onClicked: popupWindow.open()
        }
        Button {
            anchors.horizontalCenter: parent.horizontalCenter
            text: qsTr("Open Popup Native")
            onClicked: popupNative.open()
        }
    }

    component MyPopup: Popup {
        id: basePopup
        x: 0
        y: 0
        width: 200
        height: 300
        closePolicy: Popup.CloseOnEscape | Popup.CloseOnPressOutside //Popup.NoAutoClose

        Button {
            anchors.horizontalCenter: parent.horizontalCenter
            text: qsTr("Open nested Popup")
            onClicked: nestedPopup.open()
        }

        background: Rectangle {
            color: "purple"
            border {
                color: "green"
                width: 8
            }
        }

        Popup {
            id: nestedPopup
            x: 20
            y: 20
            width: 200
            height: 300
            focus: true
            closePolicy: basePopup.closePolicy
            popupType: basePopup.popupType

            background: Rectangle {
                color: "red"
                border {
                    color: "blue"
                    width: 8
                }
            }
        }
    }

    MyPopup {
        id: popupItem
        popupType: Popup.Item
    }

    MyPopup {
        id: popupWindow
        popupType: Popup.Window
    }

    MyPopup {
        id: popupNative
        popupType: Popup.Native
    }
}