When pasting an emitter from a copied overview node, only the node is pasted, and it relies on duplication of the emitter to do the actual copy. When cutting a node we delete it, along with the emitter, so there is nothing to duplicate when it is pasted.
RESULT
The emitter is not duplicated
NOTE
Undoing the deletion of the node from the cut, then pasting will duplicate the emitter
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-111618 in the post.