Why do mushrooms sporadically appear before the mycelium has fully spread

Normally, after the mycelium has fully spread, fruiting begins after a few days of recovery. But sometimes fruiting bodies appear when the mycelium has only spread through 2/3, or even 1/2, of the mushroom log, which is abnormal. Some people advertise that their spawn produces mushrooms before the mycelium has fully spread as a superior "early-maturing, high-yielding spawn," but that is deceptive nonsense; in reality, when this happens, it is a sign of spawn degeneration. Some cases are also due to external factors, such as:

(1) Using too much spawn, so old spawn blocks produce mushrooms.

(2) Packing the substrate too tightly, and opening the cultivation bag mouth too early.

(3) The low-temperature period is too long, the water content is on the high side, etc. Prevention methods: never use spawn showing signs of degeneration; choose high-quality, vigorous spawn for cultivation; keep the amount of spawn used within 20%, and break the spawn blocks into pieces the size of walnuts; strictly maintain 65% moisture when mixing the substrate, and take warming measures during low-temperature seasons; after the mycelium has fully spread, if small mushroom buds are found on any part of the bag, it proves that the mycelial growth stage has reached maturity, and the next step is the fruiting stage; at this point, open the bag mouth to carry out fruiting management.