[Zope] cookie crumbler

I have just been reading a Z2 log and have noticed that when I am logged in as a manager my username is displayed in the log, however when logged in using cookie crumbler as a normal user only 'Anonymous' appears as the user name in the log. Is there some way to make the correct user name appear in the log? AUTHENTICATED_USER returns the correct user name. I am using Zope 2.9.0. Thanks Garry