It is more of an exploit than a bug (assuming it hasn't changed behaviour since the last patch) which is why not many people have noticed it despite it being in the game for ages. It really doesn't happen because bad coaches always make the whole move in one go while good coaches will take each additional roll by itself when the reroll may change their mind. You have to make both GFIs and Pass together in the same action with nothing else. Count the times you've done that in the past. It is an unnatural action as generally you would include the first GFI in the initial move unless you had a dodge on the way.