I got the gun, but when I go back into the raid to try to grind hive kills it gives me no credit. None in general. Seems like it’s just as bugged as in D1.
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My fireteam earlier today was seeing progress while using Husk in the final encounter of Crota's End. However, if you are trying to grind out kills in the opening, or Abyss encounters then Bungie may have enemy tracking disabled there for performance reasons. You can also farm kills in any destination, though it will take 100 kills vs 50.