local function place_treasure(d)
	if d == nil or #d < 1 then
		return
	end
	for i=1,2,1 do
		local p = d[math.random(1, #d)]
		if minetest.get_node({x=p.x, y =p.y-1, z=p.z}) ~= "air" then
			minetest.set_node(p, {name = "default:treasure_chest"})
		end
	end
end

minetest.set_gen_notify("dungeon")

minetest.register_on_generated(function(minp, maxp, blockseed)
	local g = minetest.get_mapgen_object("gennotify")
	if g and g.dungeon and #g.dungeon > 4 then
		minetest.after(3, place_treasure, table.copy(g.dungeon))
	end
end)