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Panels that cannot be sealed on the ground are serrated, the others are not. We can argue why or how, but it is like that. It is hard to say this was "overlooked" when you see pictures like the one below, where internal serrated edges are perfectly apparent right in front of the nose radome joint oriented right to the front. For some reason those joints do not generate the level of return some expect, probably because there is no electrical discontinuity, maybe edges are treated too, I don't know. It simply does not make sense to have that level of attention at some point as Sukhoi shows, "forgetting" the rest of the panels in the plane and then cheating to yourself at the RCS measurements...