Workspace cloning works not properly

It seems MOODE-2009 isnt only about th workspace.delete, but also the Workspace.clone() operations.
It turns out that this also seems affected, as if I import a new workspace and then clone this into another workspace, the old content there isn't emptied correctly right before, leading to all kinds of stale data and JCR integrity exceptions (funny when you want to overwrite it...) or stale data returning as it seems some nodes then appear duplicate etc;