In Harry Potter and the Order of the Phoenix, Umbridge becomes Headmistress of Hogwarts after Dumbledore's sacking, but Dumbledore gets reinstated at the end.
But however, in Harry Potter and the Cursed Child, in the alternate reality where Cedric Diggory becomes a Death Eater, Umbridge is still Headmistress.
So what happened in this timeline's version of Order of the Phoenix? Did Dumbledore still get reinstated, then Snape, then Umbridge? After all, Scorpius said that Snape killed Dumbledore and if someone else did that, Snape made no attempt to correct him. Or did Dumbledore get reinstated, then Umbridge got reinstated after Dumbledore died?