As it turns out, the Michael Jackson estate made an agreement with the Chandler family to never “dramatize” those events. The Lionsgate film slated for release on October 3rd apparently does just that, and in the following manner that’s cited in the report:

Michael Jackson biopic ‘in jeopardy’ over detail estate are ‘banned’ from dramatising - Report claims that the film’s creators are now facing costly reshoots ahead of its planned release in October

The Michael Jackson biopic 'Michael' has run into serious trouble over an overlooked agreement that prevented one of the film's antagonists — the father of a boy who accused the singer of abuse — from being included in any biopic.