Invulnerable Villagers are still converted to Witches

Steps to reproduce the issue

1. Summon an invulnerable villager: /summon minecraft:villager ~ ~ ~ {Invulnerable:true}

2. Strike it with lightning: /summon minecraft:lightning_bolt

Expected result

The villager is not affected as it is invulnerable.

Actual result

The villager is converted into a witch despite its invulnerable status.