If you rename a file in the Finder, LibreOffice does not recognize the file as the same one. On OS X it should (that is the default). Shown here: https://youtu.be/_dMbXGLW9PI?t=4m46s
*** This bug has been marked as a duplicate of bug 92752 ***
Ack. OK, reporting them too quickly and reported this one twice. My mistake… and apologies.