Factorio Forums

Advanced material processing unlocks the electric furnace, which is made using advanced circuits, which are made using plastic bars. However, the Plastics research is not anywhere in Advanced material processing's prerequisites for any research back up the line. Not game-breaking but is quite annoying to then have to go research something to make the crafting components of something i already researched.

Thanks for the report,

Research isn't really designed this way, so this isn't a bug