Hmm...it might have to do with the order that things happen. I'm away from my test system so I can't try it right now. You left the preRegister in for $chat_userlist, right?
Did you set the cache time to 0? You'd want to do that while working on it even if you've decided to set it to 1 minute, otherwise it's easy to get confused when things don't change right away.
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