when a pig gets struck by lightning it spawns without a sword

what should happen: when a pig gets struck by lightning it turns into a zombie pigmen and the zombie pigmen holds a sword like normal

what happened: a pig gets hit by lightning and it morphs into an empty handed zombie pigmen

to reproduce: get a pig to get struck by lightning, spawn a ton of pigs and set the weather to thunder and wait until it strikes in the blob of pigs