The hold-up is Cumberbatch’s work on The Current War (which also features Spider-Man actor Tom Holland) and the filming schedule overlapping with the beginning of Infinity War.
Page Six is reporting that Aaron Lazar is set to be the stand-in for Cumberbatch during Infinity War and will fill the role for an unspecified amount of time.
Instead, it will now be his regular stand-in who will suit up as Doctor Strange until Cumberbatch’s schedule opens up.
The end of Phase 3 of the Marvel Cinematic Universe may be a few years away, but the start of production on Avengers: Infinity War is only a few weeks from now.