I imagine 'accepted bugs' are reports that those who wrangle them have sent up along the pipeline (meaning they're not yet confirmed issues).

The new one does look more like a 'feature request' than a bug report on a first glance. Looking deeper, there is the template, so perhaps they either missed that, or figured it's working as intended (though perhaps said intent is now quite dated). The first report may have been reviewed by a different person, and a more appropriate place for the new one would have probably been 'duplicate bugs' (if it was a bug).

Another possibility is, that they consider the fact that the command doesn't actually explain why it failed to add more names to the list to be a bug, while the limit is still okay to have (I don't need the feature myself (yay, Fenrir), but I do agree that it should be raised for those who do need it, along with other limits such as the maximum amount of PlayOnline messages stored etc.).

Anyblue, just guessing here of course. ^^