Update technic mod and fix missing models.

mods/technic/concrete/init.lua

@@ -84,9 +84,9 @@ minetest.register_node(":technic:blast_resistant_concrete", {
 	groups = {cracky=1, level=3, concrete=1},
 	sounds = default.node_sound_stone_defaults(),
 	on_blast = function(pos, intensity)
-		if intensity > 1 then
+		if intensity > 9 then
 			minetest.remove_node(pos)
-			minetest.add_item(pos, "technic:blast_resistant_concrete")
+			return {"technic:blast_resistant_concrete"}
 		end
 	end,
 })

mods/technic/technic/machines/other/frames.lua

@@ -320,7 +320,7 @@ local nodeboxes= {
 			else
 				--local pointed_thing = {type = "node", under = pos}
 				if pointed_thing then
-					minetest.item_place_node(itemstack, placer, pointed_thing)
+					return minetest.item_place_node(itemstack, placer, pointed_thing)
 				end
 			end
 		end,