Apply an effect (for example directionalBlur) to an item (for example an text item), add one more state, change a property of the effect ( for example angle property )in the new state. In the resulted qml, the angle property actually cannot be accessed, and will give error,
> - ReferenceError: directionalBlur is not defined
> - QML PropertyChanges: Cannot assign to non-existent property
> "angle"

sample project attached