There used to be a gate at BHX that had two sets of positioning lights. It was a sort of 'local knowledge' situation and the BA 767 that often used the stand never had a problem.
Along comes an AA 767 not aware of the local knowledge and only the quick thinking of an employee on the jetway who bashed the stop button avoided a similar collision.
It's the same old same old; if there is some system which can go wrong or be misunderstood it probably will be eventually.