[MC-131637] The slowness effect is applied to entities when the bane of arthropods enchantment is held in the off hand

The Bug:

The slowness effect is applied to entities when the bane of arthropods enchantment is held in the off hand.

For example, when you melee attack a spider while having an item enchanted with bane of arthropods in your off hand, the slowness effect is applied to the entity you attacked. This doesn't make sense because the off hand item isn't being used.

Steps to Reproduce:

Hold a sword enchanted with bane of arthropods in your off hand by using the command provided below.

/item replace entity @s weapon.offhand with minecraft:netherite_sword[minecraft:enchantments={levels:{'minecraft:bane_of_arthropods':5}}]

Summon a spider and attack it using your main hand.

Observed Behavior:

The slowness effect is applied to entities when the bane of arthropods enchantment is held in the off hand.

Expected Behavior:

The slowness effect would only be applied to entities if the weapon used for the attack has the bane of arthropods enchantment.

Linked issues

is duplicated by 2

MC-168969 Bane of Arthropods' slowness effect is applied when damage is dealt-- including by ranged weapons-- if the *currently held item* has it. Resolved

MC-254120 Shooting a mob with a persistent projectile from the offhand will activate a the mainhand enchantment's on hit effect Resolved

relates to 1

MC-73710 Holding items enchanted with thorns in your hand works as if you were wearing them Resolved

Attachments

MC-131637.mp4

Comments 6

Henry Loenwind 2018-06-18T22:06:40Z

The same applies to Thorns. Holding an item with Thorns on it in any hand damages the attacker.

Same root cause, just a neighboring method (Enchantment.onEntityDamaged() vs Enchantment.onUserHurt()).

Asteraoth 2018-08-18T14:15:32Z

Confirmed for 1.13.1-pre1

Asteraoth 2018-08-22T16:23:49Z

Confirmed for 1.13.1

Henry Loenwind 2019-07-30T16:57:03Z

A side effect of this is that it apples the enchantments for "main hand, off hand, head, chest, legs, feet, main hand". Notice how "main hand" is doubled up here...

Avoma 2022-08-03T12:38:58Z

Not 100% sure if this duplicates MC-3304. If not, then it definitely relates to it.

oowooglac 2024-03-09T16:00:51Z

The slowness effect from the enchantment is only activated when holding an item with bane of anthropods in the offhand. However, it doesn't amplify damage under these circumstances.