Every "documentation" elements written using Signavio Process Editor are lost when modifying business process in Activiti Designer

I just have an observation, I am working with Signavio Process Editor and Activiti Designer 5.9.3 which is the last update of the plug-in. I built a process on Signavio, exported as BPMN 2.0 xml file, imported on Activiti Designer and everything was ok till this point. I made changes in the process adding technical details and changing the ID's of the elements, then I save it in Activit Designer and every DOCUMENTATION ELEMENTS OF EACH ELEMENT WERE GONE¡¡¡¡ I then got back to Signavio in order to import the changed process, and almost everything in the changed process was ok, except ovbiously every documentation parts, also the THE SPECIFIC DETAILS OF THE <signavio> namespace (which is less important so far). So I realized that when you go from Signavio to Activiti Designer is ok, everything is in place, but when you go from Activiti Designer to Signavio, the documentation that was written in Signavio was gone . So I wonder if is possible to take into account that bug in the next realse of the plug-in in order to not lose documentation when you apply roundtrip Signavio-Activiti Designer-Signavio. I have atached an example.