I wanted to stay out of changing vanilla recipies, so it is indeed true, and not a bug. All I did was to add lower tier version of him, Perhaps I will add conversion recipe and tech prerequisite in one of the next updates, if it is what people would like to see
I think I prefer the way you have it currently. Many other overhaul mods like B&A and K2 change recipes and techs themselves, so I feel like the way you have it now avoids any potential conflicts with other mods. And it feels more in line with the way the devs have set up the Spidertron recipe; the Insectitron recipe is much the same as Spidertron, just lower tier. If you do end up adding conversion recipe/tech pre-reqs, could you add an option to choose between the current version and the new? I love this mod btw. Thanks! :)