Use of "system.playlistspath" setting instead of default library one where missing

I find out in two classes "special://profile/playlists" string is used instead of the setting option "system.playlistspath" to check if it's the playlist path.
I don't know what is the result in the UPNP server but in the FileUtils playlists results as not allowed to access from remote so you can't load playlists for example with "Files.GetDirectory".