Avengers: Endgame Director Confirms Multiple Alternate Endings

According to ComicBook.com, the director of Avengers: Endgame confirms that multiple alternate endings were written for the film.
Director, Joe Russo, said in an interview, “So we wrote alternate endings - obviously to throw people off the scent - or if you have to distribute scripts to people, you want to make sure the information is either redacted or not the true information. So there are many multiple endings.