Found it - Finnair has stopped the codeshare with CX on that route (AKL/HKG). They are in the process of switching current reservations to use CX flight number and future ones booked to CX flight number.
Of course I have a booking class which with CX flight number will earn 50% while with AY flight number 100% (Value). Likely the system will credit me automatically 50% and I will have to discuss with Plus service regarding the correction.