XML reporter creates invalid xml for stories with narrative in 4.x branch

In stories with narrative, the normal XML reporter creates invalid xml in 4.x since the narrative tag comes before the story tag.
The shortest story example to show the issue is this:

Narrative:
In order to xxx
As a xxx
I want to xxx

Scenario: xxx

(the story was initially reported for JBEHAVE-853 by Zihao Yu, but this issue was more relative to version issues, since it works with 3.7.3, so I decided to create a new issue mentioning 4.x directly)