Mouse event is propagated to all of the children of a StackPane?

Main.java

package jfxsbox;

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;

public class Main extends Application {
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage stage) throws Exception{
        stage.setWidth(260);
        stage.setHeight(130);

        Pane pane0 = new Pane();
        Pane pane1 = new Pane();

        pane0.onMouseMovedProperty().setValue(e -> {
            System.err.println("Pane0 (" + e.getX() + ", " + e.getY() + ")");
        });

        // Only this event handler is called.
        pane1.onMouseMovedProperty().setValue(e -> {
            System.err.println("Pane1 (" + e.getX() + ", " + e.getY() + ")");
        });

        StackPane stackPane = new StackPane();
        stackPane.getChildren().add(pane0);
        stackPane.getChildren().add(pane1);

        stage.setScene(new Scene(stackPane));
        stage.show();
    }
}