Considering what you have to go through to get 0 Cost Casting, it is an Exploit, not something that you stumble upon just playing the game. And, it takes effort and a skill has to be at 100, so it also requires grinding. Most Exploits are not patched out. Now, the Mannequin Duplication Glitch, that may very well be patched out, as that is something that can be stumbled upon and requires no effort to get.
No one creates an overpowered character in this game without effort and steps. There is no reason to patch out things like this.
Edit, also since no one is using the official editor yet, we don't know what can or can't be done with mods in this game using the official editor



