M3U Playlist Duplication in Watch Later

I use a couple of M3U playlists [ Party Mode (All Music).m3u and Party Mode (New Music).m3u ] as a workaround to add "shuffle all" functionality to the Boxee Box music player. I've noticed that when I add an M3U playlist to Watch Later, if I delete the item and then add it again, it shows up twice in Watch Later. I first noticed this when I did a factory restore to update the firmware. I had deleted the M3U playlists from Watch Later, but when I re-added them, they showed up twice. What's interesting is that if I try to delete the duplicate entry, both entries are removed!

You can duplicate this problem this way:

Add an M3U playlist from a network share to Watch Later.
Go to Watch Later and delete the M3U playlist shortcut.
Go back and re-add the M3U playlist to Watch Later.
Go to Watch Later queue and you'll see the M3U playlist listed twice.
Try to delete either shortcut and they'll both disappear.

The only way around this weird issue is for me to re-name the M3U playlist on my PC to a file name I haven't used before.