Methods setAlternativeColumnFillVisible and setAlternativeRowFillVisible do nothing.
This seems to be a problem with Modena look (in at least Lombard b85 it produced some effect on chart appearance).

To reproduce, use the following code:

import javafx.application.Application;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.chart.BubbleChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.stage.Stage;
 
public class BubbleChartSample extends Application {
 
    private BubbleChart<Number, Number> chart = createChart();
    private NumberAxis xAxis;
    private NumberAxis yAxis;
 
    private BubbleChart<Number, Number> createChart() {
        xAxis = new NumberAxis();
        yAxis = new NumberAxis();
        final BubbleChart<Number, Number> bc = new BubbleChart<>(xAxis, yAxis);
        // setup chart
        bc.setTitle("Advanced BubbleChart");
        xAxis.setLabel("X Axis");
        yAxis.setLabel("Y Axis");
        // add starting data
        XYChart.Series<Number, Number> series1 = new XYChart.Series<>();
        series1.setName("Data Series 1");
        for (int i = 0; i < 20; i++) {
            series1.getData().add(
                    new XYChart.Data<Number, Number>(Math.random() * 100, Math.random() * 100, (Math.random() * 10)));
        }
        XYChart.Series<Number, Number> series2 = new XYChart.Series<>();
        series2.setName("Data Series 2");
        for (int i = 0; i < 20; i++) {
            series2.getData().add(
                    new XYChart.Data<Number, Number>(Math.random() * 100, Math.random() * 100, (Math.random() * 10)));
        }
        bc.getData().addAll(series1, series2);
        return bc;
    }
 
    public Parent createContent() {
        return chart;
    }
 
    @Override
    public void start(Stage primaryStage) throws Exception {
        System.out.println(com.sun.javafx.runtime.VersionInfo.getRuntimeVersion());
        primaryStage.setScene(new Scene(createContent()));
        //chart.setAlternativeColumnFillVisible(true); // Should change chart appearance?
        //chart.setAlternativeRowFillVisible(true); // Should change chart appearance?
        primaryStage.show();
    }
 
    /**
     * Java main for when running without JavaFX launcher
     */
    public static void main(String[] args) {
        launch(args);
    }
}