The following test failure was spotted in our nightly headful test run. This might be a test bug or a product bug, although an internal assertion shouldn't be possible if the test program is well-behaved from a threading standpoint.

TooltipTest > testCssStylesheetChangeTooltip() FAILED
    java.lang.AssertionError
        at javafx.graphics@27-ea/com.sun.javafx.css.StyleMap.getCascadingStyles(StyleMap.java:144)
        at javafx.graphics@27-ea/javafx.scene.CssStyleHelper.resetToInitialValues(CssStyleHelper.java:490)
        at javafx.graphics@27-ea/javafx.scene.CssStyleHelper.createStyleHelper(CssStyleHelper.java:193)
        at javafx.graphics@27-ea/javafx.scene.Node.reapplyCss(Node.java:9996)
        at javafx.graphics@27-ea/javafx.scene.Node.reapplyCSS(Node.java:9959)
        at javafx.graphics@27-ea/javafx.scene.Scene$10.onChanged(Scene.java:1682)
        at javafx.base@27-ea/com.sun.javafx.collections.TrackableObservableList.lambda$new$0(TrackableObservableList.java:44)
        at javafx.base@27-ea/com.sun.javafx.collections.ListListenerHelper$SingleChange.fireValueChangedEvent(ListListenerHelper.java:162)
        at javafx.base@27-ea/com.sun.javafx.collections.ListListenerHelper.fireValueChangedEvent(ListListenerHelper.java:71)
        at javafx.base@27-ea/javafx.collections.ObservableListBase.fireChange(ObservableListBase.java:246)
        at javafx.base@27-ea/javafx.collections.ListChangeBuilder.commit(ListChangeBuilder.java:482)
        at javafx.base@27-ea/javafx.collections.ListChangeBuilder.endChange(ListChangeBuilder.java:541)
        at javafx.base@27-ea/javafx.collections.ObservableListBase.endChange(ObservableListBase.java:210)
        at javafx.base@27-ea/javafx.collections.ModifiableObservableListBase.setAll(ModifiableObservableListBase.java:103)
        at javafx.base@27-ea/javafx.collections.ObservableListBase.setAll(ObservableListBase.java:264)
        at test.robot.javafx.scene.TooltipTest.testCssStylesheetChangeTooltip(TooltipTest.java:120)