However, just four months later, Miley Cyrus left Hotel Transylvania and Selena Gomez was tapped as the new Mavis, a role she kept for the following two sequels and will presumably reprise for Hotel Transylvania 4. At the time, Cyrus attributed her exit to wanting to work on her music, but seven years later, she revealed the real reason: evidently some higher-ups weren’t pleased that she bought her then-boyfriend Liam Hemsworth a birthday cake that looked like a penis and then licked it.
Article source: https://www.cinemablend.com/news/2478532/miley-cyrus-says-she-was-kicked-off-hotel-transylvania-movie-over-penis-cake