One theory from Spider-Man: Across the Spider-Verse may explain Doctor Stranges multiversal magic mishap in the Marvel Cinematic Universes Spider-Man: No Way Home. The multiverse has been a popular concept in recent years, especially in superhero fiction, with the MCUs current Multiverse Saga centering the multiverse in its many installments following Phase 3. The various Spider-Man franchises, from the MCUs own Spider-Man movies to Sonys Spider-Man Universe have also made frequent use of the concept as well, with the multiverse being an essential component of the Spider-Verse series especially. One concept from the comics may unite each of these franchises.
https://screenrant.com/spider-man-across-spiderverse-doctor-strange-no-way-home-spell/