REG: On reset color of palette is not inherit color form parent palette

import QtQuick
import QtQuick.Window
import QtQuick.Controls

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

    palette.button: "red"

    Button {
        id: button
        anchors.centerIn: parent
        property bool paletteEdited: false

        text: paletteEdited ? "Reset Button Color" : "Change Button Color"
        onClicked: {
            if (paletteEdited) {
                //reset
                button.palette.button = undefined
            } else {
                button.palette.button = "yellow"
            }
            paletteEdited = !paletteEdited
        }
    }
}