Using Keys.onReturnPressed from Button to open Menu causes the first MenuItem to get triggered on show

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12

Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    Text {
        id: description
        width: 400
        text: "Repro: use keyboard navigation - TAB onto the Button. Press RETURN or ENTER (not SPACE) to activate the button. \n" +
              "Menu will open and will also activate Command 1 without user pressing any key (BUG) \n" +
              "Pressing SPACE or clicking the button works correctly. \n"

        wrapMode: Text.WordWrap
    }

    Button {
        id: menuButton

        anchors.top: description.bottom
        anchors.topMargin: 50

        text: "Open menu"

        onClicked: {
            theMenu.open();
        }

        Keys.onReturnPressed: onClicked()
        Keys.onEnterPressed: onClicked()
    }

    Menu {
        id: theMenu
        parent: menuButton

        onOpened: {
            // NOTE: forceActiveFocus is needed for to place the focus rectangle on the
            // first MenuItem, which is standard behavior on Windows when using keys to navigate
            theMenu.itemAt(0).forceActiveFocus();
        }

        MenuItem {
            id: command1
            text: "Command 1"

            onTriggered: console.log(text + " triggered")
        }

        MenuItem {
            id: command2
            text: "Command 2"
            onTriggered: console.log(text + " triggered")
        }

        MenuItem {
            id: command3
            text: "Command 3"
            onTriggered: console.log(text + " triggered")
        }
    }
}