A leak during a large discharge can involve the sink seal or waste connections even if a small tap flow caused no visible drip. The circumstance is useful evidence, not a reliable way to identify a failed part.
What the observation tells you
Do not repeat full-bowl tests, run the motor to increase flow or tighten fittings at random. Water can travel down surfaces before falling, making the lowest drip point misleading. Stop using the affected water path if leakage continues.
A useful next step
Record the event and photograph accessible wet tracks from a safe position. Tell the engineer whether the motor was running or off when the leak appeared.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.