So far, or at least to my knowledge, I can confirm one way of duplicating that still exists unfortunately. However, the way it's done has to be very precise. Obviously, due to the exploitation and the unfairness it causes, I won't be sharing information on how it's done, as I'd prefer it if nobody ever duplicates items. A lot of people will claim to be interested in how it's done for the best, but they merely want to know how it's done to do so with their friends/clan. Developers are aware of it and that's all that matters.