Wandering_Dandelion
Chieftain
Spoiler BUG details :
According to picture 1, you can find that I had over 200(engineering)-30.6(science/T) overflow science. After pillaging a campus(122 science in picture 2) and finish the iron working(120), and you can find my overflow science is missing(picture 3).
After another test, I found this BUG works like: whenever you pillaging and the science you get can finish the tech you are researching, your overflowed will be zeroed. The new overflow will be (pillaged get - tech rest).
By the way, I guess their is the same BUG on civic.