Blacklist blacklisted items in shulker

[SupremeDarty]

options:
    prefix: &b&LOPDuprs
    blacklist: command block and bedrock and repeating command block and debug stick and player head and wither skeleton skull

command /dupe [<number>]:
    trigger:
        set {_item} to player's tool
        if {@blacklist} does not contain {_item}:
            if inventory of {_item} is set:
                loop items in inventory of {_item}:
                    if {@blacklist} contains {_item}:
                        set {_shulkerblock} to true
            if {_shulkerblock} is not set:
                if {_item} is not air:
                    set {_number} to min((arg-1 ? 1), 6)
                    loop {_number} times:
                        give player {_item}
                else:
                    send "{@prefix} &3| You cannot dupe air, silly!"
            else:
                send "{@prefix} &3| Your shulker box has a blocked item!"
        else:
            send "{@prefix} &3| You cannot dupe that item!"

the option blacklist doesnt count for shulkers, is there a way you can?  ignore {_shulkerblock} stuff that doesnt work