A DESCRIPTION OF THE PROBLEM :
Two buttons that are brothers to each other, if you change the padding of one Button, it will erroneously affect the padding of the other Button.

REGRESSION : Last worked in version 14.0.1

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Place two Buttons in the HBox, change the padding of one of the Buttons, and then observe the impact on the other Button.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
As expected, the padding of button2 should use the default value.
ACTUAL -
In fact, the padding of button2 becomes 0 after clicking, instead of maintaining its default value!

---------- BEGIN SOURCE ----------
@Override
public void start(Stage primaryStage) {
    
    Button button1 = new Button("111");
    Button button2 = new Button("222");
    /*
     * Only the padding of button1 is changed,
     * but it affects the padding of button2.
     */
    button1.setPadding(new Insets(4,8,4,8));
    
    HBox hBox = new HBox();
    hBox.getChildren().addAll(button1, button2);
    Scene scene = new Scene(hBox, 300, 300);
    
    primaryStage.setScene(scene);
    primaryStage.show();
}
---------- END SOURCE ----------