I have not been inside the CIA, but that could just mean they haven't done any research on that or that their research is ongoing.

An institution will not have assessments on everything at any point in time. Two different institutions might have didferent assessments for a billion reasons, e.g. they could have done the research at different points in time, the underlying evisence could differ, the interviewed experts could have said different things and so on.

Two different instutions reaching different conclusions is not as surprising as it seems.