This problem mainly seems to happen on calm days,but you cannot predict that it will happen every time.Wind across the hangars or any other phenomena that will give a wind shift seem to be part of the cause.The A330 athr is very lax at low altitude and it will quite happily bring the power back to idle,and ignore a decay in speed.It just means that you need to be ready for a go around below 100ft.Something that you would not expect to do on a nice calm day when you have been cleared to land.