Aqua goblins in Lake Rathe disappeared

[Alara]

There's supposed to be a number of aqua goblins that spawn in an underwater tower in Lake Rathe, but the tower and goblins both seemed to have disappeared. All the goblins show up on track, but they are not there. Can't tab target them. See invisible doesn't show them. And there is no tower where there should be a tower. These goblins are required for the Druid Epic Quest.