Trying to drag an event in the scheduler duplicates (doubles) the event drag hints, but only in DayView. 

Reproduction:
https://codesandbox.io/p/sandbox/still-cloud-xrrx72?file=%2Fapp%2Fmain.tsx%3A21%2C26

Workaround:
The problem occurs when the event data doesn't have isAllDay property set. Even if you simply set it to false seems to resolve the issue. Problem is - Kendo's docs say that "The DataItem type does not limit the user to a specific fields in the data array", however the presence of this field is mandatory for the proper functioning of the DayView.