When resizing the Swing JFrame which contains panel with PieChart, the paint method paints something crazy.

SSCCE:
public class PieChartSample2 {

    private static PieChart chart;

    private static JFXPanel fxpanel = new JFXPanel();

    public static void main(String[] args) {
        final JFrame frame = new JFrame();
        frame.getRootPane().setOpaque(false);
        frame.setSize(500, 500);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        final JPanel panel = new JPanel(new BorderLayout());
        panel.setOpaque(false);
        panel.setBorder(BorderFactory.createLineBorder(Color.RED));

        fxpanel.setBackground(Color.YELLOW);
        panel.add(fxpanel, BorderLayout.CENTER);

        Platform.runLater(new Runnable() {
            @Override
            public void run() {
                createScene();
            }
        });

        frame.setContentPane(panel);

        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                frame.setVisible(true);
            }
        });
    }

    protected static void createScene() {
        ObservableList<PieChart.Data> pieChartData = FXCollections.observableArrayList(new PieChart.Data("Grapefruit", 13), new PieChart.Data("Oranges", 25), new PieChart.Data("Plums", 10), new PieChart.Data("Pears", 22), new PieChart.Data("Apples", 30));
        chart = new PieChart(pieChartData);

        chart.setLegendVisible(false);
        chart.setAnimated(true);

        decorateWithStyle(chart);

        Scene scene = new Scene(chart);

        chart.setTitle("Imported Fruits");

        fxpanel.setScene(scene);
    }

    private static void decorateWithStyle(PieChart pieChart) {
        pieChart.setStyle("-fx-background-color: #525252");
        pieChart.lookup(".chart-pie-label").setStyle("-fx-fill: #ffffff; -fx-font-size: 0.9em;");
    }
}