1 pollenated honeycomb = 5 pollen. The queen starts with a base of 30 pollen that she can store, meaning 6 fields. The pollen bees actually randomly roam the flowers until they themselves collect 5 pollen, which is their internal storage. Once they have 5 pollen, a bool is switched on and they go back and deposit it into a honeycomb. I never made bars over their head because it just was never necessary and was a background balancing mechanic that looked ugly if it was visualized. You have a good eye though, nice catch!