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could be shedding a leaf. it it progresses upward, it needs more Nitrogen. Looks like 1 leaf at bottom, so i'd wait for more progression before reacting. Sometimes a plant just sheds a leaf. it sucks it down and it falls off.
Nitrogen deficiency.. If it was a clone it went into flower and is going back into veg, it will monster top and be fine. If its an auto its just deficient in nitrogen and magnesium. Happy growing 💨