Drying pistils half way through flower on auto

Normal. You answered your own question, only worried. Look at a nice dried and cured bud, yours are right on track brother where they are in flower. You expect 3 weeks, it looks about that if not add a couple more days 👊👍

no it is part of how the plant grows the bud, these pistils do dry up they spend there time searching for pollen. this does not happen in most cases unless your breeding. this is the plants ways of fulfilling it purpurse and thats to grow, this browning is normal. this pistils dyr and turn amber. it is nature