Hi Joseph,
Sorry for the inconvenience.
We have validated your reported issue with TreeView component. We would like to mention that the reported scenario “Drag and drop creates the duplicate nodes in TreeView” had already been considered as a bug from our end. The fix for this issue will be included in Volume 4 release which is expected to be rolled out by the mid of December 2021.
You can track the status of your reported problem through the below portal link.
Until then, we appreciate your patience.
Regards,
Keerthana R