I've set the scene's fill to `TRANSPARENT` but a black fill is rendered instead. This was working on jre 8u5

{code:java}
public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        primaryStage.setTitle("Hello World");
        primaryStage.initStyle(StageStyle.UNIFIED);
        final VBox vBox = new VBox();
        vBox.setAlignment(Pos.CENTER);
        vBox.setStyle("-fx-background-color: transparent");
        vBox.getChildren().add(new Label("Hello World"));
        
        // remove this and it works!
        primaryStage.setScene(new Scene(vBox, Color.TRANSPARENT));
        primaryStage.show();
    }


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