QQuickStylePlugin crashes when calling qmlClearTypeRegistrations

(gdb) backtrace
#0  0x0000000000000045 in ?? ()
#1  0x00007ffff7bc694b in QScopedPointerDeleter<QQuickProxyTheme>::cleanup (pointer=<optimized out>) at /usr/include/qt5/QtCore/qscopedpointer.h:52
#2  QScopedPointer<QQuickProxyTheme, QScopedPointerDeleter<QQuickProxyTheme> >::~QScopedPointer (this=0x7fffbc02d1f8, __in_chrg=<optimized out>) at /usr/include/qt5/QtCore/qscopedpointer.h:107
#3  QQuickStylePlugin::~QQuickStylePlugin (this=0x7fffbc02d1e0, __in_chrg=<optimized out>) at qquickstyleplugin.cpp:49
#4  0x00007fffd6de3845 in QtQuickControls2Plugin::~QtQuickControls2Plugin (this=0x7fffbc02d1e0, __in_chrg=<optimized out>) at qtquickcontrols2plugin.cpp:95
#5  QtQuickControls2Plugin::~QtQuickControls2Plugin (this=0x7fffbc02d1e0, __in_chrg=<optimized out>) at qtquickcontrols2plugin.cpp:96
#6  0x00007ffff5736a66 in QLibraryPrivate::unload(QLibraryPrivate::UnloadFlag) () at /usr/include/c++/8/bits/atomic_base.h:390
#7  0x00007ffff572b15b in QPluginLoader::unload (this=0x7fffbc001f40) at plugin/qpluginloader.cpp:263
#8  0x00007ffff61e33e1 in ?? () from /usr/lib64/libQt5Qml.so.5
#9  0x00007ffff61905b9 in qmlClearTypeRegistrations() () from /usr/lib64/libQt5Qml.so.5
#10 0x000000000040116a in main (argc=1, argv=0x7fffffffdb68) at ../../StyleBug/main.cpp:10

#include <QApplication>
#include <QQmlApplicationEngine>
#include <QQuickStyle>

int main(int argc, char *argv[])
{
    int res;
    int style = -1;
    do {
        qmlClearTypeRegistrations();
        QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);

        QApplication app(argc, argv);

        if (style != -1)
            QQuickStyle::setStyle(QQuickStyle::availableStyles()[style]);

        QQmlApplicationEngine engine;
        engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
        if (engine.rootObjects().isEmpty())
            return -1;

        res = app.exec();
        style += res;
    } while (res > 0);
    return res;
}

import QtQuick 2.9
import QtQuick.Controls 2.2

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")
    Button {
        text: "Change Style"
        onClicked: Qt.exit(1);
    }
}