Villagers don't convert to Witches when struck by lightning

When striking a Villager with a channeling trident during a lightning storm, they will not convert into a Witch, yet the player will still receive the advancement. 

On a similar note, Pigs do not convert into anything when struck by lightning either, though this may be a feature as Zombie Pigmen were removed.

Mooshrooms still do convert into Brown Mooshrooms when struck by lightning, though.