I don't play as BE, what bug is it you speak of? Do you mean you can't fit more than 1 cannon in a 3-slot (e.g. ranged+std), or you can only use one of the two 3-slots? If it's the second one, then TBH, it should be kept as a feature. BE already gets extra cannon rape, and being able to stick up to 3 weapons in a single slot set is kinda dumb.