Copying nodes in the console leads to warning wrt markupids

For example, in the console when copying a node, you see in the console:

12.11.2013 11:44:44 WARN http-bio-8080-exec-3 [XmlAjaxResponse.writeComponent:95] Component '[ExceptionFeedbackPanel [Component id = feedback]]' with markupid: 'id220' not rendered because it was already removed from page