First_Principal
The problem is not so much which country might have been involved - it really shouldn't matter - the initial risk analysis should be done by the system owner/operator, in this case, the airline. Secondly, the fact that the problem did not manifest itself during the trial simulations simply means that the test schedule was incomplete and inadequate. Both issues should be managed by the system owner, even if the work is done by another agency.
Notwithstanding that, in this instance, the impact on the flight was insignificant, particularly given the approximations and other inexactitudes involved in loading calculations, the potential for a more serious event to occur as a result of similar process failures should be of concern.