Add furnace to legacy aliases

data/mods/legacy/init.lua

@@ -34,6 +34,7 @@ minetest.alias_node("lava_flowing", "default:lava_flowing")
 minetest.alias_node("lava_source", "default:lava_source")
 minetest.alias_node("torch", "default:torch")
 minetest.alias_node("sign_wall", "default:sign_wall")
+minetest.alias_node("furnace", "default:furnace")
 minetest.alias_node("chest", "default:chest")
 minetest.alias_node("locked_chest", "default:chest_locked")
 minetest.alias_node("cobble", "default:cobble")