If you have any of the events, (wake, leave, etc) programed for circ, it will over ride the fan auto setting on the screen.
Interesting to know and makes sense. But mine is not over ridden.
Based upon what I am hearing, I am starting to wonder if my heat pump is simply NOT wired to trigger the aux heater on defrost. And I just never noticed this until now with the snow and cold weather and me snow-bound stuck at home.