QML: palette.link and palette.linkVisited not working as expected

import QtQuick 2.14
import QtQuick.Window 2.14
import QtQuick.Controls 2.14

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

    Rectangle {
        anchors.fill: parent
        TextArea {
            anchors.fill: parent
            textFormat: TextEdit.RichText
            palette.link: "red"
            palette.linkVisited: "green"
            text: '<a href="http://google.com">This here</a>'
            readOnly: true
            onLinkActivated: Qt.openUrlExternally(link)
        }
    }
}