I noticed same behavior when using small and medium af zones when eye was detected and confirmed “in focus” but was outside the focusing zone - often focus was on nose or leaps (closest to camera texture inside focusing zone)

Switching to largest (custom with maximum frame coverage) zone seems to fix this in my case

Seems like it’s some kind of priority issue when non-tracker af inside focusing zone gets higher score then eye tracker outside focusing zone

Anyway I am very pleased with af speed comparing to z7 gen1 I used to have, hope Nikon will improve accuracy with firmware updates as they did with gen1