I found what I think is an interesting ore duplication bug. But those are the fancier light blue conditional conveyors off of a central 200 slot tricky hopper. There is one of those underneath as well which is outputted to the standard hopper underneath. the left conveyer was set to titanium, back was nickel, right was gold, bottom was set to biomass. All hoppers start empty. Add one rock in the hopper closest to player, and suddenly a flood of titanium, nickel, and gold go to the three other hoppers. one rock in, will end up if you let it run, fill up the three ore hoppers. Fun but also annoying when you are trying to figure out why you keep getting output that did not go in. Not sure if this also happens for other types of objects...did not test those, just the accidental ore was found as part of my parsing a shared output from a cargo lift.