One problem is that this was a 1 vs 2 disagree. So the system used the "2" that agreed. (Just like a pilot would I suspect, given three sources of data where 2 agreed). The most likely scenario for such a case is the "1" is bad, so ignoring it and doing nothing else is a good plan EXCEPT if you are doing flight tests. So if there was a message which just said "take no action" I'm not surprised they decided not to bother line crews with it.
A lot of this comes down to the big topic from this accident - the way such flight tests are (were, rather) conducted.