clone teststep with Valid HTTP Status Codes assertions

Hello, 

when I clone a teststep with assertions, I have the assertions cloned as well (as expected).

But when I look at the "Valid HTTP Status Codes" assertion, the value were not cloned. It is empty!

Same behavior when using groovy script or direct UI.

I use the latests stable version :  SoapUI 5.2.1

Is this a bug?

Thanks

-- 

Pascal Greliche