Inconsistent Behavior / UI Bug: Drag'n'Drop Replication

I just stumbled over a double replicate in one group. It was a result of pulling a document onto the in “See also & Clasify” (as move, not replicate) listed group. The group already had one replicate.

This doesn’t happen when you use the keyboard (enter), nor when you DnD-replicate multiple times on the same S&C listed group.

Good eye!
@cgrunenberg : I confirmed this behavior here. You do end up with two replicants in the group.