MetaData cleared in `vtkMRMLIGTLConnectorNode::PushNode`

Hi,
I was wondering why all the metadata is cleared in `vtkMRMLIGTLConnectorNode::PushNode(..)` since this basically prevents any external client to set any metadata to the device before the node is pushed. For example, I would like to set the name of an image as metadata since the name of the device is capped to 20 chars.
Thanks for your answer,
Federico