TextArea from Material theme is not properly clipped when used inside Flickable

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQuickStyle>

int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);

    QGuiApplication app(argc, argv);

    QQuickStyle::setStyle("Material");

    QQmlApplicationEngine engine;
    const QUrl url(QStringLiteral("qrc:/main.qml"));
    QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
                     &app, [url](QObject *obj, const QUrl &objUrl) {
        if (!obj && url == objUrl)
            QCoreApplication::exit(-1);
    }, Qt::QueuedConnection);
    engine.load(url);

    return app.exec();
}

import QtQuick 2.11
import QtQuick.Window 2.11
import QtQuick.Controls 2.3

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

    Rectangle {
        anchors.fill: parent
        color: "grey"
    }

    Flickable {
        width: 300
        height: 300

        TextArea.flickable: TextArea {
            implicitHeight: 200
        }
    }
}