Vaadin dialog window show default scroller

I think the new vaadin dialog window in v14.2 has some issue. I just added one textfield into a formlayout and added it to the Dialog window. But it shows a vertical scroller like below

The code is

Dialog dialog = new Dialog();
FormLayout layout = new FormLayout(new TextField("Queue Name", mqQueue.getName(), ""));
            dialog.add(new H2("Queue Properties"));
            dialog.add(layout);
            dialog.open();

if you know any fix, please update in the comments.