In Feb I booked AKL-CHC on 1 day and then (on the following day) CHC-WLG in the late morning and then WLG-AKL in the evening, all on the 1 PNR (using multi-city booking tool). I only got 12SPs for the first trip and 12SPs for the whole second day's travel, even though that second day consisted of two flights with several hours in between.

I wrote to NZ to request SPs for the third leg but never got a response. I always book each leg individually now.

In response to serfty's suggestion of possible top tier scrutiny, I was only NZ*G at the time.