Dirk Headhunter passive mysteriously disappears

Serrated Dirk Unique – Headhunter: After killing any enemy, your next damaging spell will deal 40 bonus physical damage to all enemies it hits (30 second cooldown)

Ghostblade +55 attack damage, +10% cooldown reduction Unique: +18 Lethality armor penetration Unique: +40 movement speed out-of-combat. Active Unique: Gain +20% movement speed for 6 seconds. 45 second cooldown.

Edge of Night +250 health, +55 attack damage Unique: +18 Lethality armor penetration Active Unique: Channels for 1.5 seconds to gain a Spell Shield spell shield that blocks the next enemy ability within the next 5 seconds (45 second cooldown). Damage will interrupt the channel. You can move while channeling. If the channel is interrupted, the item is put on a reduced 5 second cooldown.

If before you were able to deal extra damage from Dirk why Ghostblade and EoN don't?