Always On Top does not work on Linux with Wayland backend

Hi,
I am trying to make sure a Qt/QML application stays on top of other windows in Wayland/Weston Linux desktop system.
What I've tried in order to solve this is I've added the WindowStaysOnTopHint in my main.qml:

main.qml

import QtQuick 2.0
import QtQuick.Controls 2.0
import QtQuick.Window 2.2

ApplicationWindow {
    visible: true
    visibility: "FullScreen"
    maximumWidth: 1920
    maximumHeight: 720
    minimumWidth: 1920
    minimumHeight: 720
    width: 1920
    height: 720
    title: qsTr("App")
    flags: Qt.FramelessWindowHint|Qt.WindowStaysOnTopHint
    MainScreen{
        anchors.fill: parent
    }
}

{{ main.cpp}}

QGuiApplication app(argc, argv);
QQmlApplicationEngine engine;
engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
if (engine.rootObjects().isEmpty())
     return -1;
return app.exec();

It works in my PC, but it does not work in target platform.
Host PC:                    Ubuntu 16.04, with Xorg, has Qt 5.10.1
Target platform:    Yocto-based Linux Distro, Weston compositor with wayland backend, has Qt 5.8.0

When I launch a second app that is compiled without Qt.WindowStaysOnTopHint, it comes on top of the first app. But I want to have first one to stay always on top. I suspect this might be a Qt bug on systems that use wayland backend.

Any guidance and ideas are appreciated. Thanks