特定アイテムの識別による条件分岐が不動

function getBuckPack() :: item:
    set {_value} to "省略"
    set {_item} to skull with value {_value}
    #set {_item} to chest
    return {_item}

function getBuckPack() :: item:
    set {_value} to "省略"
    set {_item} to skull with value {_value}
    #set {_item} to chest
    return {_item}

every 5 tick:
    loop players:
        set {_inv} to loop-player's inventory
        loop {INV_NUM::*}:
            set {_item} to slot loop-value-2 of {_inv}
            if slot 10 of {_inv} is getBuckPack():
                処理！！！

every 5 tick:
    loop players:
        set {_inv} to loop-player's inventory
        loop {INV_NUM::*}:
            set {_item} to slot loop-value-2 of {_inv}
            if slot 10 of {_inv} is getBuckPack():
                処理！！！