For example, a task run is scheduled to be triggered every 20 minutes with the latest run happening at 01:40:00. With this schedule, next execution time is set to 02:00:00.
However, during the DST change, the clock moves back from 02:00:00 to 01:00:00, repeating the hour between 01:00:00 and 02:00:00. Therefore, the next scheduled execution does not happen immediately at the end of the next 20-minute timeframe, even though it appears that 20 minutes have actually passed since the previous trigger at 01:40:00. The subsequent triggers at 01:00:00, 01:20:00, and 01:40:00 are ignored, and the task is triggered only at the adjusted 02:00:00 time after the transition.