In a recent interview, Bruce Campbellwho has rolled something for Doctor Strange in the Multiverse of Madnesshas commented on last minute changes that had to be made in the sequel.
The actor noted that Marvel Studios put a lot of hands into the additional photography, saying that director Sam Raimi had to add scenes that Marvel told him he had to shoot. Now, Campbell clarified that this is because Marvel makes eight of these movies at once, and they are constantly updating their stories.
The Marvel guys, they’re doing eight of these movies at the same time, so they’re always updating the stories. So my partner Sam Raimi had to add scenes that Marvel told him he had to shoot, and he had to cut scenes that didn’t make sense anymore. So until May comes around, I don’t think even Benedict Cumberbatch knows if he’s in the movie or not.