尽管已安装，但JavaFX PieChart工具提示仍未显示

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.chart.PieChart;
import javafx.stage.Stage;

public class PieChartExample extends Application {
    @Override
    public void start(Stage stage) {
        final PieChart chart = new PieChart();
        chart.setTitle("Sample Pie Chart");

        PieChart.Data slice1 = new PieChart.Data("Slice 1", 13);
        slice1.setTooltip(new Tooltip("This is Slice 1"));

        PieChart.Data slice2 = new PieChart.Data("Slice 2", 25);
        slice2.setTooltip(new Tooltip("This is Slice 2"));

        chart.getData().addAll(slice1, slice2);

        Scene scene = new Scene(chart, 800, 600);
        stage.setScene(scene);
        stage.show();
    }

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

.tooltip {
    -fx-background-color: rgba(0, 0, 0, 0.8);
    -fx-text-fill: white;
    -fx-font-size: 12px;
}

scene.getStylesheets().add("path/to/your/stylesheet.css");