Porting plugins to MS4

No custom plugins in 4.0 is a bad news.
Does it worth keeping on testing and reporting issues with the MS3 plugin on MS4 ?

Could you test this basic one in MS4 ?
For me, nothing happens... :-/

import QtQuick 2.2
import MuseScore 3.0
import QtQuick.Controls 2.2
import QtQuick.Layouts 1.1 // was 1.3 in MS3, but 1.1 in Temperaments
//import QtQuick.Window 2.3

MuseScore {
    menuPath: "Plugins.testBasicGUI"
    description: "This plugins shows a BasicGUI "
    version: "1.0"
    requiresScore: false
    pluginType: "dialog"
    id: mainWindow
    //width: container.childrenRect.width + (container.anchors.margins * 2)
    //height: container.childrenRect.height + (container.anchors.margins * 2)
    width : 300
    height : 300

    ColumnLayout {
        id: container
        anchors.margins: 5
        anchors.fill: parent
        spacing: 5
        CheckBox {
            text: "I'm the default component"
            checked: true
        }

        Button {
            text: qsTranslate("QPlatformTheme", "Close")
            Layout.alignement: Qt.AlignLeft
            onClicked: {
                //mainWindow.parent.Window.window.close();
                Qt.quit();
            }
        }
    }
}