Was just playing around with your command combiner and used it to build the basic blacksmith building from the villages. The version that had a self destruct seemed to dislike my relative coordinates but the other one left some of the command blocks and redstone so I just filled that area with air to get rid of it. Not sure if that's the best way to handle it as I do end up with an activator rail being dropped but at least it comes up a clean build and no other leftovers now!
Was just playing around with your command combiner and used it to build the basic blacksmith building from the villages. The version that had a self destruct seemed to dislike my relative coordinates but the other one left some of the command blocks and redstone so I just filled that area with air to get rid of it. Not sure if that's the best way to handle it as I do end up with an activator rail being dropped but at least it comes up a clean build and no other leftovers now!