No, it is bugged, my son perched upon pride rock sniping while me and another stayed below by the bridge where the Hobgobblins spawned and had no problems. If all 3 players stay on the rock it will trigger the glitch.
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Well then you didnt say that the first time, if atleast one of your fireteam isnt on the lower area by the second wave it is known to treat your positioning as a despawn of sorts.