Lame Duck commented on Lame Duck's bug in Oxygen Not Included - [Early Access]If Power Regulation is researched manually first, without starting the research chain by clicking "Advanced Automation", then it is not repeated.
Power Regulation will be researched twice if Advanced Automation is selected and nothing in the research chain from Power Regulation=>Advanced Automation is already researched. Pure conjecture: this might be caused by the two paths to Advanced Automation, where the system queues Power Regulation twice since it is a base for both paths. Power Regulation=>Internal Combustion=>Advanced Power Regulation=>Advanced Automation Power Regulation=>Automatic Control=>Generic Sensors=>Advanced Automation The behavior repeats consistently in multiple games. Generally have researched... Interior Decor Plumbing=>Sanitation=>Decontamination Jobs => Advanced Research Jobs => Brute-Force Refinement Basic Farming=>Meal Preparation=Agriculture ...before attempting Advanced Automation chain.