I was trying to get the Cache of a cloner object in the GetVirtualObjects(self, op, hh) method.
First I tried it in the python generator, there was already a cloner in the scene and in the python generator I returned the cache so to say, but this approach doesn´t work out in an object plugin.
Even if I create a temp_doc. The returned cache is always None.
But converting the cloner with a ModelingCommand is not the best way, if the cloner produces for instance a million clones.

This method works in a python generator when the clone is already in the scene

cloner = op.GetDown()
return cloner.GetCache().GetClone()

But creating a cloner and returning its cache doesn`t work.

cloner = c4d.BaseObject(1018544)
c4d.BaseObject(c4d.Ocube).InsertUnder(cloner)
return cloner.GetCache().GetClone()

Is there a way to get the cache in a plugin?
Sweep, Extrude, other Generators, Deformers and parametric objects work perfectly.