QTabWidget move bug with stylesheet

#include <QApplication>
#include <QMainWindow>
#include <QTabWidget>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    a.setStyleSheet("QWidget{background-color: #302F2F;}");
    QMainWindow MainWindow;
    QTabWidget* TabWidget = new QTabWidget(&MainWindow);
    TabWidget->addTab(new QWidget(TabWidget),"Tab1");
    TabWidget->addTab(new QWidget(TabWidget),"Tab2");
    MainWindow.setCentralWidget(TabWidget);
    TabWidget->setMovable(true);
    MainWindow.show();
    return a.exec();
}