yl_spawnit/mobs_banshee.lua

-- https://gitea.your-land.de/your-land/bugtracker/issues/5238#issuecomment-61128
local function is_valid_bones(pos)
	local meta = minetest.get_meta(pos)
	if meta:get_string("owner") ~= "" then
		-- prevent spawning on fresh bones
		return false
	end

	local inv = meta:get_inventory()
	if inv:is_empty("main") then
		-- prevent spawning on player-placed bones nodes
		return false
	end

	return true
end

spawnit.register({
	entity_name = "mobs_banshee:banshee",
	groups = { monster = 1 },
	chance = yl_spawnit.base_chance,
	near = { "bones:bones" },
	max_in_area = 1,
	max_in_area_radius = 16,
	min_time_of_day = yl_spawnit.dusk,
	max_time_of_day = yl_spawnit.dawn,
	min_player_distance = (mobs_banshee.reach or 14) + 1,
	spawn_in_protected = false,
	check_pos = function(pos)
		local pos1 = vector.subtract(pos, 1)
		local pos2 = vector.add(pos, 1)
		local poss = minetest.find_nodes_in_area(pos1, pos2, "bones:bones")
		for i = 1, #poss do
			if is_valid_bones(poss[i]) then
				return true
			end
		end
		return false
	end,
}, yl_spawnit.settings.check_nodes)