One thing I noticed. Although it shouldnt matter if you add a mocahce tag and cache the sequence, your order of operations in the object manager should ideally be organized so the thing being referenced is at the top of the manager list, and the cloner is below.
So I would put your cloner i this case at the bottom of the list.
ALSO–I see you have the “kugel” object set as a chld of the “2 Matrix Kugel” object, and you have that matrix object targeting the child . I would actually reverse the heirarchy so the matrix is a child of the kugel (or at least above the matrix in the OM). I would think this would create a conflict as the matrix is trying to clone onto its own child.
I would also try making your clones render instances if posible.
You should only really need to mo-cache the cloner (and do it internally if possible)