Simple Language: Invoke clone() method

I am getting an exception if the clone method is invoked on an object (which has an implemented clone method) via simple language:
org.apache.camel.language.bean.RuntimeBeanExpressionException: Failed to invoke method: clone() on null due to:

• org.apache.camel.component.bean.MethodNotFoundException: Method with name: clone() not found on bean ...

Example code:
...
.to("language://simple:${body.clone()}")
...
For full example see attachment:
InvokeCloneTest.java

Same code worked with Camel 2.X