https://www.cnet.com/news/robert-downey-was-the-only-avenger-the-russos-trusted-with-endgame-script/

Some other actors, including Benedict Cumberbatch, who plays Doctor Strange, got a copy that included his scenes only, Joe Russo said.

"Part of our motivation to do that is it just takes a lot of pressure off of people, because it is hard to constantly censor yourself," Anthony Russo said. "So we take a lot of pressure off of people by just saying, 'OK, the less you know, the less you have to mind yourself."