Here's my script if that helps.
Scriptname OnDeathHeart extends ObjectReference Ingredient Property TBJDragonheart Auto event OnDeath() Game.GetPlayer().AddItem(TBJDragonheart, 1)endEvent
Scriptname OnDeathHeart extends ObjectReference Ingredient Property TBJDragonheart Auto event OnDeath() Game.GetPlayer().AddItem(TBJDragonheart, 1)endEvent