Applying "-fx-content-display" style to a CheckBox or RadioButton with Graphic node produces "duplicate children added" exception:

Exception in Application start method
Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:491)
at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:778)
Caused by: java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:867)
at com.sun.javafx.application.LauncherImpl.access$000(LauncherImpl.java:56)
at com.sun.javafx.application.LauncherImpl$1.run(LauncherImpl.java:158)
at java.lang.Thread.run(Thread.java:724)
Caused by: java.lang.IllegalArgumentException: Children: duplicate children added: parent = CheckBox@273dd385[styleClass=check-box]'Ololo'
at javafx.scene.Parent$2.onProposedChange(Parent.java:444)
at com.sun.javafx.collections.VetoableListDecorator.add(VetoableListDecorator.java:199)
at com.sun.javafx.scene.control.skin.CheckBoxSkin.updateChildren(CheckBoxSkin.java:59)
at com.sun.javafx.scene.control.skin.LabeledSkinBase.handleControlPropertyChanged(LabeledSkinBase.java:186)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$2.call(BehaviorSkinBase.java:179)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$2.call(BehaviorSkinBase.java:177)
at com.sun.javafx.scene.control.MultiplePropertyChangeListenerHandler$1.changed(MultiplePropertyChangeListenerHandler.java:55)
at javafx.beans.value.WeakChangeListener.changed(WeakChangeListener.java:88)
at com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChangedEvent(ExpressionHelper.java:176)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
at javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:105)
at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:112)
at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:145)
at javafx.css.StyleableObjectProperty.set(StyleableObjectProperty.java:82)
at javafx.css.StyleableObjectProperty.applyStyle(StyleableObjectProperty.java:68)
at javafx.scene.CssStyleHelper.resetToInitialValues(CssStyleHelper.java:297)
at javafx.scene.CssStyleHelper.createStyleHelper(CssStyleHelper.java:179)
at javafx.scene.Node.impl_processCSS(Node.java:8646)
at javafx.scene.Parent.impl_processCSS(Parent.java:1192)
at javafx.scene.control.Control.impl_processCSS(Control.java:870)
at javafx.scene.Parent.impl_processCSS(Parent.java:1204)
at javafx.scene.Node.processCSS(Node.java:8575)
at javafx.scene.Scene.doCSSPass(Scene.java:538)
at javafx.scene.Scene.preferredSize(Scene.java:1503)
at javafx.scene.Scene.impl_preferredSize(Scene.java:1570)
at javafx.stage.Window$9.invalidated(Window.java:733)
at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:109)
at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:143)
at javafx.stage.Window.setShowing(Window.java:799)
at javafx.stage.Window.show(Window.java:814)
at javafx.stage.Stage.show(Stage.java:243)
at javafxapplication1.JavaFXApplication1.start(JavaFXApplication1.java:39)
at com.sun.javafx.application.LauncherImpl$5.run(LauncherImpl.java:810)
at com.sun.javafx.application.PlatformImpl$6.run(PlatformImpl.java:278)
at com.sun.javafx.application.PlatformImpl$5$1.run(PlatformImpl.java:244)
at com.sun.javafx.application.PlatformImpl$5$1.run(PlatformImpl.java:241)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl$5.run(PlatformImpl.java:241)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$300(WinApplication.java:39)
at com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:101)
... 1 more
Java Result: 1

To reproduce, use the following application:
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.CheckBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

public class Main extends Application {

    public static final String style = "-fx-content-display: bottom;";

    @Override
    public void start(Stage stage) throws Exception {
        Rectangle r = new Rectangle(10, 10, Color.BLUEVIOLET);
        CheckBox b = new CheckBox("Ololo");
        b.setGraphic(r);
        System.out.println(style);
        b.setStyle(style);
        Scene s = new Scene(new Group(b));
        s.setFill(Color.DARKORANGE);
        stage.setScene(s);
        stage.setTitle(com.sun.javafx.runtime.VersionInfo.getRuntimeVersion());
        stage.show();
    }
}