m0useanswered grow question 6 months ago Plants will not switch to flower immediately when on 12/12, they need to be mature first. and even then it takes them a good 2 weeks to build up enough flowering hormones to do it before we see signs of it happening.
Its why when you grow photoperiod seeds on 12/12 seed to harvest, they do not bloom once they sprout as they have to hit their maturity first. think of it like plant puberty, babies cant have kids till they hit puberty and sexually mature.
Autoflowers are different and do what ever they want. kinda freaky mutants. they can bloom from a week of being alive.
Good Luck!