executionTime.nextExecution(startDateTime) error

**1. cron desc:**     "0 40 08 ? * *"    

**2. code desc:**
DateTime startDateTime = new DateTime(1601426291898L);  //  2020-09-30T08:38:11.898+08:00
startDateTime = executionTime.nextExecution(startDateTime); // startDateTime changed 2020-10-01T08:40:00.000+08:00

**3. question desc:**  2020-09-30T08:40:00.000+08:00 was losted
