In the explained scenario the ScheduleView tries to scroll to the Start time of the Appointment and it couldn't as it is not visible. However I can suggest you a workaround in which implementation you can check whether the start of the Appointments is before the DayStartTime and if so to create new Slot which starts at the DayStartTime and scroll it into view. Please check the attached sample project which demonstrates the exact approach.
Hope this works for you.
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