GroovyInterceptable / invokeMethod does not correctly in Groovy 1.8.0 when Methods with no arguments are "delegated"

class SimpleFlow implements GroovyInterceptable {

    def invokeMethod(String name, args) {
        System.out.println("time before ${name} called: ${new Date()}")

        def calledMethod = SimpleFlow.metaClass.getMetaMethod(name, args)
        calledMethod?.invoke(this, args)

        System.out.println("time after ${name} called: ${new Date()}\n")
    }

    void simpleMethod1(){
        System.out.println("simpleMethod1() called")
        simpleMethod2Nested()
    }

    // works well when using an argument
    void simpleMethod2Nested(){
        System.out.println("simpleMethod2Nested")
    }

    public static void main(String[] args) {
        def flow = new SimpleFlow()
        flow.simpleMethod1()
    }
}