It’s literally just a workprint.
A workprint is a rough version of a motion picture, used by the film editor(s) during the editing process. Such copies generally contain original recorded sound that will later be re-dubbed, stock footage as placeholders for missing shots or special effects, and animation tests for in-production animated shots or sequences.https://en.wikipedia.org/wiki/Workprint
That’s it, True Superhero Fans!
What do you think about the concept of workprints and the basics of film production? Sound off in the comments below. #ReleaseTheJJCut