In the following code, the second button is blurred (and should not be?):

package test;

import javafx.application.*;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.scene.effect.*;
import javafx.stage.*;

public class BugBlur extends Application {

	public static void main(String[] args) {
		Launcher.launch(BugBlur.class, args);
	}

	public void start(final Stage stage) {
		Group group = new Group ();
		
		Button button = new Button ("TEST");
		button.setLayoutX(100);
		button.setLayoutY(100);
		button.setScaleX(2);
		button.setScaleY(2);
		group.getChildren().add(button);
		
		Button button2 = new Button ("TEST");
		button2.setLayoutX(100);
		button2.setLayoutY(150);
		button2.setScaleX(2);
		button2.setScaleY(2);
		group.getChildren().add(button2);
	    GaussianBlur blur = new GaussianBlur();
	    blur.setRadius(0);
	    button2.setEffect(blur);
		
		Scene scene = new Scene(group);
		stage.setScene(scene);
		stage.setVisible(true);
	}
}