It is well known (see [here](https://scifi.stackexchange.com/questions/162489/what-content-is-in-the-new-beren-and-l%C3%BAthien-book-compared-to-other-published-wo), [here](https://scifi.stackexchange.com/questions/193976/what-content-is-in-the-new-fall-of-gondolin-book-compared-to-other-published-wor?noredirect=1&lq=1)) that, when *Beren and Lúthien* and *The Fall of Gondolin* were published, they contained no new content: all of it was already printed in previous works edited by Christopher Tolkien.

Was the same true for *The Children of Húrin*? Or is the first and last time new content was published regarding the legendarium?