Not so much a bug as a QOL change, Goblin Thievery can grab ANY ability off of an enemy, including ones like Hero, Mythical, and Boss. Hero will kill all of your Goblins if you're running a split, Mythical kills all duplicates, and Boss just makes you lose the game if any Goblin dies. It would be a nice change if it disallowed these kind of abilities, so that you don't randomly press a "lose the game" button.
