noted a new failing test:

    @Test @Ignore("left-over from choiceBoxSkin fix")
    public void testChoiceBoxSetItems() {
        ChoiceBox<String> box = new ChoiceBox<>();
        installDefaultSkin(box);
        replaceSkin(box);
        box.setItems(observableArrayList("one"));
        box.getItems().add("added");
    }

Overlooked the listener to box' items property when fixing JDK-8244657 .. needs to be removed in dispose along with the others ;)