EDIT- This is not a bug, but an intended feature, sorry, someone should close this thread. Sorry I do not have a clearer image, I must have accidentally hit Print screen again. Anyways I managed to build a normal metal extractor inside of an advanced one. I am not sure how exactly i did it, but after trying to build a normal extractor on a spot i just destroyed, it ended up going in here after some clicks. So the small metal extractor is inside the big one, as you can see right between the energy and metal bars, there is a third prong.
It's not a bug, it's intended. In order to avoid the hassle of TA style where you had to reclaim the regular Extractor and rebuild the Advanced Extractor and to avoid the hassle of SupCom Style Upgrades, now you cna just build the Advanced Extractor Directly over the Basic Extractor. Mike
Ah sorry, I did not know that. Now i can stop destroying all my extractors. Thought i finally found something others have not found, everyone in the game did not seem to know about it. Oh well, ty for the clarification.