The first and last lightning bolts convert villagers to witches while all of the bolts in between don't

Steps to reproduce:
1) Put down a sticky piston with a lightning rod on the face and a channeling-enchanted trident thrown on the rod
2) Activate and deactivate the piston fast and repeatedly
3) Spawn villagers while the piston is moving again and again

Expected results:
Villagers get turned to witches by lightning and get damaged

Actual results:
Villagers remain as villagers and also don't take damage from the lightning.