The WoW client will immediately disconnected from WoW when you shift-right-click the link item from the test "disconnect_bug" addon to a chat message and send it.

Steps to reproduce:
- install disconnect_bug addon
- log in to WoW
- whisper someone or yourself and shift-right-click the item link from the "disconnect_bug" addon into the message
- send message
** you are then disconnected from WoW

The "disconnect_bug" addon can as be downloaded from
http://www.realisticsoftware.com/public/disconnect_bug.zip

I didn't read the entire addon, but it almost looks like it's trying to link an item that the server has not yet seen - in this case "Plans: Dark Iron Sunderer"

AFAIK, this is not a bug; you WILL be disconnected if you attempt to link an item that the server has not yet seen (as in, no one with the item has logged in since the last restart, nor has the item dropped from any mob since restart).

The test addon can be modified to use any of the item links in the data structure.

The below test addon tests with "Emblem of Heroism" item and disconnects.

The "disconnect_bug" addon (configured for "Emblem of Heroism") can as be downloaded from
http://www.realisticsoftware.com/public/disconnect_bug2.zip