There wasn’t an explicit reason given for the delay, but in a statement on X, Super Mario and Zelda creator Shigeru Miyamoto — who is serving as a producer on the movie — said that the move was made for “production reasons” and that “we will take the extra time to make the film as good as it can be.”
source: https://www.theverge.com/news/682751/legend-of-zelda-live-action-movie-date-delay
