It used to be that when you added AI artwork into a CC library and gave it a name there, it kept its name when the artwork was placed into for example InDesign document. All my libraries have artwork with names, but when I place any of them into InDesign it simply shows up as "Artwork 1.ai" in Links. However, this doesn't seem to be buggy for all artwork in the CC libraries, just new ones I created in the last few days.