Use swap_node instead of set_node in more places

mods/ITEMS/mcl_crimson/init.lua

@@ -531,7 +531,7 @@ minetest.register_abm({
 	action = function(pos, node)
 		if minetest.get_item_group(minetest.get_node(vector.offset(pos, 0, 1, 0)).name, "solid") > 0 then
 			node.name = "mcl_nether:netherrack"
-			minetest.set_node(pos, node)
+			minetest.swap_node(pos, node)
 		end
 	end
 })

mods/ITEMS/mcl_lush_caves/init.lua

@@ -65,7 +65,7 @@ function mcl_lush_caves.makelake(pos, _, pr)
 	if not nn[1] then return end
 	--local dripleaves = {}
 	for i=1,pr:next(1,#nn) do
-		minetest.set_node(nn[i],{name="mcl_core:water_source"})
+		minetest.swap_node(nn[i],{name="mcl_core:water_source"})
 		--[[
 		if pr:next(1,20) == 1 then
 			table.insert(dripleaves,nn[i])
@@ -78,9 +78,9 @@ function mcl_lush_caves.makelake(pos, _, pr)
 			local pp = vector.add(v,vv)
 			local an = minetest.get_node(pp)
 			if an.name ~= "mcl_core:water_source" then
-				minetest.set_node(pp,{name="mcl_core:clay"})
+				minetest.swap_node(pp,{name="mcl_core:clay"})
 				if pr:next(1,20) == 1 then
-					minetest.set_node(vector.offset(pp,0,1,0),{name="mcl_lush_caves:moss_carpet"})
+					minetest.swap_node(vector.offset(pp,0,1,0),{name="mcl_lush_caves:moss_carpet"})
 				end
 			end
 		end

mods/MAPGEN/mcl_mapgen_core/init.lua

@@ -297,7 +297,9 @@ mcl_mapgen_core.register_generator("structures",nil, function(minp, maxp, blocks
 		if struct.deco_id then
 			local has = false
 			for _, pos in pairs(gennotify["decoration#"..struct.deco_id] or {}) do
-				local pr = PcgRandom(minetest.hash_node_position(pos) + 42)
+				local realpos = vector.offset(pos,0,1,0)
+				minetest.swap_node(realpos, {name = "air"})
+				minetest.fix_light(vector.offset(pos,-1,-1,-1),vector.offset(pos,1,3,1))
 				if struct.chunk_probability == nil or (not has and pr:next(1,struct.chunk_probability) == 1 ) then
 					mcl_structures.place_structure(vector.offset(pos,0,1,0), struct, pr, blockseed)
 					has=true