update nether tree loop, @Ombridride l hope it works for you, and fix missing degrotate paramtype2 of leaves

nether/init.lua

@@ -741,14 +741,17 @@ function nether.grow_tree(pos, generated)
 	local trunks = {}
 	local trunk_corners = {}
 	local h_stem = math.random(h_stem_min, h_stem_max)
-	local stems = {{x=pos.x, y=pos.y+h_stem, z=pos.z}}
-	local fi
-	while not fi do
-		for n,p in pairs(stems) do
-			local used_dirs = {}
+	local todo,n = {{x=pos.x, y=pos.y+h_stem, z=pos.z}},1
+	while n do
+		local p = todo[n]
+		todo[n] = nil
+		n = next(todo)
+
+		local used_dirs,u = {},1
 		for _,dir in pairs(dirs) do
 			if math.random(1,2) == 1 then
-					table.insert(used_dirs, dir)
+				used_dirs[u] = dir
+				u = u+1
 			end
 		end
 		if not used_dirs[1] then
@@ -777,14 +780,14 @@ function nether.grow_tree(pos, generated)
 				trunks[p.x.." "..p.y+i.." "..p.z] = true
 			end
 			p.y = p.y+h
-				table.insert(stems, p)
+			--n = #todo+1 -- causes small trees
+			todo[#todo+1] = p
 		end
 		if p.y > pos.y+h_trunk_max then
-				fi = true
 			break
 		end
-			stems[n] = nil
-		end
+
+		n = n or next(todo)
 	end
 	local leaves = {}
 	local fruits = {}

nether/items.lua

@@ -527,6 +527,7 @@ minetest.register_node("nether:leaves", {
 	inventory_image = "nether_leaves.png",
 	wield_image = "nether_leaves.png",
 	paramtype = "light",
+	paramtype2 = "degrotate",
 	is_ground_content = false,
 	groups = {snappy=3, leafdecay=3, leaves=1},
 	drop = {