MessageDialog emits accepted signal twice

Running the example from https://doc.qt.io/qt-5/qml-qtquick-dialogs-messagedialog.html

import QtQuick 2.2
import QtQuick.Dialogs 1.1

MessageDialog {
    id: messageDialog
    title: "May I have your attention please"
    text: "It's so cool that you are using Qt Quick."
    onAccepted: {
        console.log("And of course you could only agree.")
        Qt.quit()
    }
    Component.onCompleted: visible = true
}

it prints out the line "And of course you could only agree." twice

Adding a StandardButton.Cancel I can also see that onCancel is called twice as well

It happens for both Ok/Enter and Cancel/ESC

This works just fine in 5.12.0

Unfortunately the Enter button does not trigger an "accepted" signal in the labs MessageDialog  in 5.12.0 so switching to labs is not a suitable workaround for us