The issue in the thread addresses a drag and drop between Scheduler and Grid, while yours is relying only on the built-in drag and drop functionality of the Scheduler to move appointments.
Attached you can find a sample project containing a Scheduler with XML data source. Would you please modify the attached project so that it better represents your scenario and replicates the issue? Then, you can send it back to us as an attachment of an official support ticket. That would allow us to investigate locally and help you more efficiently.
Once we have a resolution in the support thread, we can share the answer here, for convenience and better visibility from the community.
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