Splash potion of harming is not affecting zombies and skeletons, is this natural or is this a bug?? I thought undead mobs might be immune, but I am unsure, please check.
Also, witches are now spawning in random places, aren't they only supposed to spawn in huts or swamp biomes???
Read the updates notes and the wiki before posting.
Undead mobs are immune to Splash potions of Harming.
In the latest updates Witches now spawn naturally.