ADDITIONAL SYSTEM INFORMATION :
Windows 64 bit machine
Open JDK 11.0.2
Open JFX 11.0.2


A DESCRIPTION OF THE PROBLEM :
I have added ChangeListener for JavaFX scrollbar valueProperty() variable. This listener is not calling in Open Java FX 11. The same code was works in Oracle JDK 8 which includes Java FX with it.

Note: This "ScrollBar" is looked up from WebView.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Attached the sample program code, please run it. ChangeListener is not calling when we scroll the scrollbar in webview.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
ChangeListener should be called when we scroll webview scrollbar

---------- BEGIN SOURCE ----------
package samplefxprogram;

import java.util.Set;
import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.geometry.Orientation;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.stage.Stage;
import javafx.scene.control.ScrollBar;
import javafx.scene.web.WebView;
import javafx.scene.layout.Pane;
import javafx.scene.web.WebEngine;

public class SampleFXProgram extends Application {
    @Override
    public void start(Stage primaryStage) {
        int alert_width = 939;
        int alert_height = 582;

        WebView view = new WebView();
        view.setContextMenuEnabled(false);
        view.getEngine().setJavaScriptEnabled(true);

        WebEngine webEngine = view.getEngine();
        webEngine.load("https://openjfx.io/");

        view.setMaxSize(939 + 2, alert_height);
        view.setMinSize(alert_width + 2, alert_height);
        view.setPrefSize(alert_width + 2, alert_height);

        ScrollBar viewsb = null;
        Set<Node> viewNodes = view.lookupAll(".scroll-bar");
        for (final Node node : viewNodes) {
            if (node instanceof ScrollBar) {
                viewsb = (ScrollBar) node;
                if (viewsb.getOrientation() == Orientation.VERTICAL) {
                    break;
                }
            }
        }

        Pane root = new Pane();
        root.getChildren().addAll(view);

        Scene scene = new Scene(root);
        primaryStage.setScene(scene);
        primaryStage.setTitle("ScrollBar Example");

        viewsb.valueProperty().addListener(new ChangeListener<Number>() {

            @Override
            public void changed(ObservableValue<? extends Number> observable,
                    Number oldValue, Number newValue) {
                System.out.println("Webview Scrollbar Listener calling");
            }
        });

        primaryStage.show();
    }

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

CUSTOMER SUBMITTED WORKAROUND :
Not found any work around.

FREQUENCY : always