When binding an observable list to a normal list, and then removing the binding later with Bindings#unbindContent, the arguments must be in a specific order, even though unbindContent makes no such assertions. Providing them in the "wrong" order fails silently and the binding persists.

The issue was found in modules/javafx.base/src/main/java/com/sun/javafx/binding/ContentBinding.java where it expects the arguments to be in a certain order.

Sample program:

```
    public static void main(String[] args) {
        ObservableList<String> l = FXCollections.observableArrayList();
        List<String> x = new ArrayList<>();

        Bindings.bindContent(x, l);
        Bindings.unbindContent(l, x);

        l.add("A");

        System.out.println(x);
    }
```
This will still modify the array list x, even though it shouldn't.