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Witches that have drank a fire resistant potion will no longer despawn if they are farther than 32m from a player but less than 128m from a player.
Hostile mobs normally despawn over time when farther than 32m but less than 128m from a player. Witches that have not drank a fire resistant potion will follow these rules. But if the witch drinks a fire resistant potions it will no longer follow these rules.
- Place a witch inside a glass box with it standing on a magma block or lava. (see picture)
- Move the player 40m away from the witch.
- Wait indefinitely for the witch to despawn.
May also work with any potions the witch drinks.
These witches will still despawn if the player goes farther than 128m from them.