I regularly use the 'export this folder as a catalog' feature to make catalog backups of certain subsets of my pictures. My naming convention has always been in the form of YYYMMDD.HHmm
With LightroomCC version 2015/9 (OS X version) I noticed that Lightroom now truncates the catalog name used after the dot, so it becomes 'YYYYMMDD'. This also happens when creating a new catalog through the File->New Catalog menu.
Is there a reason that this restriction on the catalog name has been introduced?