Author has written 69 stories for Harry Potter.
A Note On Spelling Differences
JKR wrote it as Asteria. That's an "e" there, not an "o". And given a choice, I'm more likely to think Time got it wrong, not JKR. It makes sense that it is Asteria: 1.) She is a figure of Greek mythology like Draco, Daphne and Scorpius. A Greek goddess connected to divination, astrology and necromancy. 2.) Asteria means "starry, falling star" which fits with the whole star theme the Black/Malfoys have going. 3.) Asteria was a Titan, like Hyperion. That means Scorpius Hyperion Malfoy was named after his mother and his father. 4.) The aster , like the narcissus, is a flower. So Asteria, like Narcissa, has a floral name. That is why I write Asteria Greengrass and not "Astoria".
I prefer Asteria but Rowling went with Astoria.
Also, Harry Potter and the Cursed Child is not canon to me (except for the parts I like). I saw how Star Wars treated the EU and I'm assuming this is the same until Rowling releases a book that follows up on CC canon.