When a Skeleton or Blaze is attacking a player with their ranged attacks, any projectile that doesn't hit the player but hits a Zombie Pigman causes that pigman to aggro at the player, NOT the mob that accidentally shot them.

In older versions of the game, any pigmen accidentally shot by a hostile mob would attack that mob, not the player.

How to replicate: Play in survival and battle a Blaze or Skeleton among Pigmen. The afflicted Pigman will aggro at the player, and will likely call for help.