Why don’t the flowering steamed buns I made bloom?

With high steam temperature and strong steam supply, "flowering" steamed buns with cracked surfaces can be steamed.

Key points for flowering: the dough must be fermented for enough time, and the mouth of the dough must face upward; when placing the dough on the basket, do not touch it, otherwise it will not "bloom"; . The fire must be strong when placing the cage, and the cage must be placed when the water is boiling;