Wrong Graphic color of RadioMenuItem

ADDITIONAL SYSTEM INFORMATION :
java version "12.0.1" 2019-04-16
Java(TM) SE Runtime Environment (build 12.0.1+12)
Java HotSpot(TM) 64-Bit Server VM (build 12.0.1+12, mixed mode, sharing)

Windows 10

A DESCRIPTION OF THE PROBLEM :
I use a Label as a graphic of a RadioMenu Item.
The color of the text is wrong after several open of the menu

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Execute the attached sample app
Click on the menu > it should open label aa
Click elsewhere > it should close the menu
Re-Click on the menu => Label is displayed white !!
Hover with mouse on aaa the label is here !!!

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The label should always be display black and white on hove
ACTUAL -
The label is white on white

---------- BEGIN SOURCE ----------
/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.Menu;
import javafx.scene.control.MenuBar;
import javafx.scene.control.RadioMenuItem;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

/**
 *
 * @author Cyril F <cyril.f>
 */
public class BugLabelLadder extends Application {

    @Override
    public void start(Stage primaryStage) {
        RadioMenuItem radioMenuItem = new RadioMenuItem("aaa", new Label("label"));
        Menu menu = new Menu("menu");
        menu.getItems().add(radioMenuItem);
        MenuBar menuBar = new MenuBar(menu);

        StackPane root = new StackPane();
        root.getChildren().add(menuBar);

        Scene scene = new Scene(root, 300, 250);

        primaryStage.setTitle("BugLabelLadder");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }

}

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

CUSTOMER SUBMITTED WORKAROUND :
No Workaround

FREQUENCY : always