See the Console window - you should be informed that spawning is not possible since the object is already in the scene.
This safeguard is enabled to prevent unwanted duplicated being placed in the scene. You can bypass this, however, by attaching a Remember Transform component to the object, checking Save scene prescene?, and then entering in a non-zero value in its Linked prefab ConstantID box. This can be the same ID listed below (once Retain in prefab?) is checked.
Comments