I don't think a part of the brain tries to exfiltrate information from another by using moments when predictive coding is invalidated. Those moments when prediction fails are very useful, we learn from them.
We learn how to create representations of the present by conditioning them on correct prediction of the future. We build world models and thus get to imagine future scenarios, very useful in planning our actions both for achieving higher rewards and avoiding dangers.
So we get sensory representation and world modelling for free - no need to be taught explicitly, the teaching signal is just the link between present and future.