I think it is very common. In particular on the "big" ideas that are obvious to people in respective fields (making a thinking machine, a flying machine, let's

I think it is very common. In particular on the "big" ideas that are obvious to people in respective fields (making a thinking machine, a flying machine, let's turn this into a bomb etc.) where you would have multiple dispersed people somewhat competing, somewhat stealing ideas from each other. And I also think there is quite a bit of winner writes the history / reverse history writing. Like had the Germans won World War II, German inventors would be widely credited in computing. Or the stuff on who invented the neural net brought up by the recent Nobel prize.