Everyone agrees that the end is not satisfactory. More details could be shown.
As we know, the same author's "The Rise Of Phoenixes" novel will be adapted to TV.
I have not read Novel, but I have read that Fuyao is the continuation and that the phoenixes came from Fuyao's blood. In the Chinese translation of Legend of Fuyao, she's gonna have three kids. (2 girls and 1 boy)
Within a week, "The Rise Of Phoenixes" will be aired.
If there is no mistake in the above, this may be the reason for the missing scene.
In the new drama, has the potential to see flashbacks in this regard.