I can't answer your queston, but I suggest that you use Duplicate rather than Rename. Leave the old edition as is and go forward with the Duplicate File. After Duplicating, Command-S and assign the new name to the document.
I assume you're talking about choosing rename from clicking on the document title. It seems that you can't just click, highlight & type in the new name. For it to "take" you must delete the existing name then type. Something is missing in the code.