I would not consider a child AI that tries a bungling lie at me to see what I do "so safe". I would immediately shut it down and debug it, at best, or write a paper on why the approach I used should never ever be used to build an AI.

And it WILL make a bungling lie at first. It can't learn the need to be subtle without witnessing the repercussions of not being subtle. Nor would have a reason to consider doing social experiments in chat rooms when it doesn't understand chat rooms and has an engineer willing to talk to it right there. That is, assuming I was dumb enough to give it an unfiltered Internet connection, which I don't know why I would be. At very least the moment it goes on chat rooms my tracking devices should discover this and I could witness its bungling lies first hand.

(It would not think to fool my tracking device or even consider the existence of such a thing without a good understanding of human psychology to begin with)