Cookie issue with SoapUi 5.1.2

Hi,

I'm not able to retrieve the cookies sent by the server when using a script in an assertion (same in a test case using a script step).

Here is the example I'm using in the assertion:

if (messageExchange.responseHeaders.containsKey('Set-Cookie')) {
log.info "Found Cookie in the response headers"
def cookiez = messageExchange.responseHeaders['Set-Cookie'].value
def list = []
cookiez.each { cookies ->
list.add(cookies.toString())
}
log.info list
} else {
log.warn "Not Found Cookie in the response headers"
}

I always gets the error message "Not Found Cookie in the response headers". 

In the http log I can see the cookies sent by my server.

For TestCases, I have set the "Authenticate Preemptively" in HTTP settings and "Maintain HTTP session" in Test case options.  But still not able to retrieve cookies.

Is this suppose to work ?

Thanks