It is well known (see here, here) 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?

It is well known (see here, here) 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 this the first and last time new content was published regarding the legendarium?