There is no smoke. I’ve already responded to this post you made and given a very thorough explanation of what was going wrong with your casting. You’ve made another post claiming the exact same thing (that something is wrong with the spell system) where other players have chimed in to say they are not having any problems once they practice.
I have no idea where this rumor got started, or who is spreading it, but as the person who wrote the code, I can tell you, there is nothing in the code that says “do this differently if you are in a party or have aggro.” It’s simply not true, and there’s nothing else to say on the matter.