Thanks for you feedback.
We investigated the issue and I have logged in our Feedback portal, you can track its status on the following link
. However the fix should available in the next internal build. For now what I can suggest you as a work around is to keep the resizing Appointment in a variable (you can save it in CanResize method for example) and use in the ResizeCanceled afterwards.
I'm sorry for any inconvenience caused. I have also updated your Telerik points for your involvement.
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