ADDITIONAL SYSTEM INFORMATION :
Windows 10
Oracle JDK 8 update 192 and OpenJDK 11.0.1 with OpenJFX 11.0.1 jlinked in it

A DESCRIPTION OF THE PROBLEM :
The DatePicker closes with no action when picking a day or when clicking on a previous or next button for month/year.
This happens on Oracle JDK 8 update 192 and OpenJDK 11.0.1 with OpenJFX 11.0.1 jlinked in it

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the given code, open the popup, click on a day / button

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
popup closes and the date is set / month or year changes to previous / next and popup stays open
ACTUAL -
popup closes, no date set

---------- BEGIN SOURCE ----------
package test.mavenproject8;

import java.awt.BorderLayout;
import javafx.application.Application;
import javafx.embed.swing.JFXPanel;
import javafx.embed.swing.SwingNode;
import javafx.scene.Scene;
import javafx.scene.control.DatePicker;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
import javax.swing.JPanel;

public class JavaFXApplication9 extends Application
{
  
  @Override
  public void start(Stage stage) throws Exception
  {
    stage.setScene(getMainJavaFxScene());
    stage.show();
  }
  
  private static Scene getMainJavaFxScene()
  {
    BorderPane root = new BorderPane();
    SwingNode node = new SwingNode();
    root.setCenter(node);
    node.setContent(createIntermediateSwingLayer());
    return new Scene(root);
  }
  
  private static JPanel createIntermediateSwingLayer()
  {
    JPanel jpanel = new JPanel();
    jpanel.setLayout(new BorderLayout());
    jpanel.add(createJFXPanel(), BorderLayout.CENTER);
    return jpanel;
  }
  
  private static JFXPanel createJFXPanel()
  {
    JFXPanel jfxPanel = new JFXPanel();
    Scene jfxPanelScene = new Scene(createInnerJavaFxScene());
    jfxPanel.setScene(jfxPanelScene);
    return jfxPanel;
  }
  
  private static BorderPane createInnerJavaFxScene()
  {
    BorderPane jfxPanelBorderPane = new BorderPane();
    DatePicker datePicker = new DatePicker();
    jfxPanelBorderPane.setCenter(datePicker);
    return jfxPanelBorderPane;
  }

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

---------- END SOURCE ----------

FREQUENCY : always