Singer was removed from the film amid rumours that he’d been incredibly difficult to work with during the production, and also went missing from the set after a Thanksgiving holiday (allegations he denied in a statement following his dismissal).
Well, it seems that unlike Solo: A Star Wars Story, which saw Ron Howard replacing Phil Lord and Chris Miller, Singer will remain credited as director of the film, with producer Graham King telling Empire:
“Bryan Singer is the credited director of the film. Basically, Bryan had some personal issues going on. He wanted to hiatus the movie to deal with them, and the movie had to get finished.