Ive killed this guy 4 times and he has yet to drop the Goblin’s Guide to Elementium. It was no longer required to MC him to learn the pattern as he is supposed to drop a book that teaches you how to smelt Elementium.
You sure it is a prepatch change and not a patch change?
You cant MC and learn it anymore. The pre-patch runs on the same client as the beta (3.4.0) so yes im sure.