It's no different from the "kill 3 Hive Knights" that means a trip to orbit and back into the Fist of Crota mission. A minor annoyance, I agree.
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And they spawned in all zones. Kill one in steppes, move to mothyards. Head over to divide for a patrol mission and there they are again...
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When the Kill 3 hive knights bounty was introduced, you did not have to go to orbit, they spawned randomly on the earth and the moon with a notification that "The blades of Crota have started a ritual" and a blade would spawn out of a cave with a bunch of acolytes. You never had to go to orbit. When the Husk of the pit stopped dropping is when they stopped appearing randomly.