In the horde encampment, the first wave does not show up. If this happens, it ends up coming with the second wave at once, and the boss does not spawn at the end of the 8 waves.
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Just happened to us. Same exact situation as this thread: TBC Mount hyjal trash bug - unclearable wave 1 just never spawned then when wave 8 was supposed to spawn thrall despawned.
We log out reset to fix it.