Non-Editable ComboBox wrongly propagates KeyEvent that has already been accepted

import QtQuick 2.15
import QtQuick.Window 2.15
import QtQuick.Controls 2.15
import QtQuick.Layouts 1.15

Window {
    width: 400
    height: 300
    visible: true

    function discardSpaceKey(keyEvent, source) {
        console.log(`Discarding [Space] in ${source}...`)
        keyEvent.accepted = true
    }

    ColumnLayout {
        anchors.fill: parent

        TextField {
            id: textField
            Layout.fillWidth: true
            text: "TextField"
            Keys.onSpacePressed: (event) => discardSpaceKey(event, "TextField")
        }

        ComboBox{
            id: editableComboBox
            Layout.fillWidth: true
            editable: true
            model: ["ComboBox:Editable", "Alpha", "Bravo", "Charlie"]
            Keys.onSpacePressed: (event) => discardSpaceKey(event, "Editable ComboBox")
        }

        ComboBox{
            id: nonEditableComboBox
            Layout.fillWidth: true
            editable: false
            model: ["ComboBox:NonEditable", "Delta", "Echo", "Foxtrot"]
            Keys.onSpacePressed: (event) => discardSpaceKey(event, "Non-Editable ComboBox")
        }
    }

    Component.onCompleted: textField.focus = true
}