a couple of years ago, Transport Canada mistakenly issued performance questions A with performance graphs B, and everyone still passed. Go figure.
perhaps they realized their mistake and awarded everyone points for the questions where graphs were needed? Happened with IAA with my PPL exam - Air Law I think it was, they made a small booboo with the pictures not matching questions, admitted the problem quickly and rectified the situation accordingly..
oopsies and booboos happen everywhere, no doubt.. it's just how you deal with them and how likely you are to admit the problem in the first place is what makes all the difference