JavaFX拖动未装饰的Stage "Fallthrough“问题

public class CustomScene extends Scene {
    private double xOffset;
    private double yOffset;

    public CustomScene(Parent root) {
        super(root);
        setOnMousePressed(event -> {
            xOffset = event.getSceneX();
            yOffset = event.getSceneY();
        });

        setOnMouseDragged(event -> {
            Stage stage = (Stage) ((Node) event.getSource()).getScene().getWindow();
            stage.setX(event.getScreenX() - xOffset);
            stage.setY(event.getScreenY() - yOffset);
        });
    }
}

public class Main extends Application {
    @Override
    public void start(Stage primaryStage) {
        try {
            Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
            primaryStage.initStyle(StageStyle.UNDECORATED);
            primaryStage.setScene(new CustomScene(root));
            primaryStage.show();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        launch(args);
    }
}