Run this code and press Tab key (focus of button gone) and press Tab again - focus traversing is break

 @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Hello World!");
        Button btn = new Button();
        btn.setText("Say 'Hello World'");
        
        Label label = new Label("Text label");
        label.setFocusTraversable(true);
        VBox root = new VBox();
        
        Button btn2 = new Button();
        btn.setText("Say 'Hello World'");
        
        root.getChildren().addAll(btn, label, btn2);
        primaryStage.setScene(new Scene(root, 300, 250));
        primaryStage.show();
    }