Player kills from lightning rods + channeling tridnets

The bug

When a mob is killed by lightning attracted to a lightning rod from a channeling trident it doesn't count as a player kill, not dropping xp or higher loot rates.

How to reproduce

1. Make a chamber like this (the trident has channeling on it): 
   
2. Spawn mobs in the chamber
3. Press the button twice and see the mobs be killed but no xp be dropped