We are aware of the explained issue and it has already been logged in our internal backlog. I also logged it in our Feedback portal so you can easily track its status on the following link:
However as workaround you can implement a custom ScheduleView DragDropBehavior
and override the CanDrop
method the following way:
var scheduleView = state.ServiceProvider.GetService<IDialogProvider>()
var destinationSlot = state.DestinationSlots.First();
(destinationSlot.Start.Hour < scheduleView.ActiveViewDefinition.DayStartTime.Hours)
Note that this will only work for DayViewDefinition, you can improve the implementation as per your requirements.
Hope this will work for you.
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