The Necrotic Grip exotic isn’t restoring melee energy when a corrupted combatant dies, which is half of its perk.
There also seems to be an issue where the corruption doesn’t spread when a combatant is corrupted by using Thorne and they die from corruption. I have to kill them with Thorne for it to spread.
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It does work but not in the way you might think, based on tests that have been done it about a 20% restore and it has around a 2% chance to activate on a kill. It might be bugged but technically it is working, it is one of the best new exotics even if that part isn’t working