When in any water level or source, the lunge enchantment has no effect and does not move the player or take durability off the weapon. It instead acts as if the lunge enchantment has not been applied to the weapon.
Environment
In any water level or water source block in the latest version while trying to use a spear with the lunge enchantment.
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We're tracking this issue in MC-302699, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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