Explosion chest trap is able to drop loots for twice

-- in scenarios/chest_explosion.lua
local function triggertrap(inst)
    inst:AddComponent("lootdropper")
    inst.components.lootdropper:SetLoot(drop_loot)
    inst.components.lootdropper:DropLoot()
    --give the chest a loot dropper.
    --make the chest drop gunpowder and the fire object from fire hounds.
end

there have been an existed lootdropper component for the chest, so when you trigger the trap, it drops two more boards which is the loots for destroyed and it drops the total loots again when destroyed.