I cannot reveal the source or the company but a major household-name automotive company would have several teams working on projects, with one pre-selected as the "real" one and the others not told their work would be discarded. The idea being that this way you can multiply the size of each engineering team and starve the competition of competent engineers. The fact this system exists was not disclosed to the engineers in order to prevent them from quitting. I know this from an engineer who quit after accidentally meeting a member of another team within the company working on the exact same project.