When you go approach the dragon to use the quest item, you automatically crash right after. But if you log quick enough, you'll continue the quest. If you do manage to log in quickly though, the mobs will not be able to attack the dragon that's being escorted. Also, once you reach the end to finish the quest, the quest icon doesn't count it as "completed" quest but instead counted as "In-Progress" quest.
EDIT (forgot to put this on here): The dragon will only attack the mob if the mob only uses a beam energy attack. But the mobs itself cannot attack by using auto-attack.
