ADDITIONAL SYSTEM INFORMATION :
ASUS ZenBook
Windows 10 Pro (1909)
OpenJDK 11.0.7
JavaFX 14.0.1, 15-ea+6

A DESCRIPTION OF THE PROBLEM :
Scroll gesture events of type SCROLL isn't surrounded with SCROLL_STARTED and SCROLL_FINISHED when I'm using the integrated touchpad.

https://javadoc.io/doc/org.openjfx/javafx-base/latest/javafx.graphics/javafx/scene/input/ScrollEvent.html

The correct sequence of events is generated if to make a gesture on the touch screen.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Run example code
2. Make a scroll gesture in the opened window (dragging two fingers over a touchpad)

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Events should be generated in the following sequence:
1. SCROLL_STARTED with touch count 2
2. multiple SCROLL events with touch count 2
3. SCROLL_FINISHED with touch count 2
4. multiple SCROLL events with inertia (optionally)
ACTUAL -
only multiple SCROLL events generated.
Not surrounded with STARTED and FINISHED events.
Touch count is always zero.

---------- BEGIN SOURCE ----------
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.input.ScrollEvent;
import javafx.scene.input.ZoomEvent;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;

public class ScrollEventsApp extends Application {

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

    @Override
    public void start(Stage primaryStage) {
        var root = new Pane();
        root.addEventHandler(ScrollEvent.ANY, (event) -> {
            System.out.print(event.getEventType());
            System.out.print(" " + event.getTouchCount());
            if (event.isInertia()) System.out.print(" INERTIA");
            if (event.isDirect()) System.out.print(" DIRECT");
            if (event.isAltDown()) System.out.print(" ALT");
            if (event.isControlDown()) System.out.print(" CTRL");
            if (event.isMetaDown()) System.out.print(" META");
            if (event.isShiftDown()) System.out.print(" SHIFT");
            if (event.isShortcutDown()) System.out.print(" SHORTCUT");
            System.out.println();
            event.consume();
        });
        var scene = new Scene(root, 600, 400);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Only using of touchscreen generates correct sequence of events.

FREQUENCY : always