The Metascore doesn't show up anymore in new movies

Does anyone know what is going on with the metascore on IMDB? All the new releases (House of Gucci, West Side Story etc) don't have a metascore rating and it is really confusing. Ghostbusters Afterlife has a 59 Metascore on IMDB but on Metacritic it has 45, so is it just a synchronising issue? Can anyone help?