Should eating and drinking be stopped as soon as the adhan starts in sahur?

Aleykum salam. For example, if the start time of fasting is 03.20, exactly 03.20 is the beginning of fasting. Since the adhan is at the same time, the adhan begins after the fasting begins. Accordingly, every bite eaten when the adhan starts means breaking the fast. It is the same for iftar time. The adhan begins the second the fast ends. There is no need to wait for the adhan to end, because the adhan can only begin when the fast is over. In imsak, the opposite is true. Accordingly, at imsak, eating must have ended with the minute on the calendar.