Edited: Crust Bursters required as quest kills do not correctly initiate combat. They pop in and out of the ground and quickly go in and out of combat. Occasionally, they will appear to stick out of the ground for extended periods of time but are not animated and slowly move in one direction. They are pretty heavily bugged. Their larger counterparts work just fine, however, rare elites and other very large crust burster type mobs are not glitched.
Edited: Crust Bursters required as quest kills do not correctly initiate combat. They pop in and out of the ground and quickly go in and out of combat. Occasionally, they will appear to stick out of the ground for extended periods of time but are not animated and slowly move in one direction. They are pretty heavily bugged. Their larger counterparts work just fine, however, rare elites and other very large crust burster type mobs are not glitched.