Forster came on board in 2022 along with his producing partner Renee Wolfe and producer Ben Browning.
David Magee was tapped to adapt the book, which was published in 2008.
The novel was a bestseller that won several awards, including the American Newberry Medal.
Neil GaimanJamie McCarthy/Getty Images for Writers Guild of America East
The allegations were made during Tortoises four-part podcastMaster: The Allegations Against Neil Gaiman.
