API create document do not work as expected while using parentId parameter

I want to create backlog documents by using backlog APIs. Everything works fine until I want to create child documents in backlog documents tree (just like wikis)

Backlog API documentation stated that When this ID is specified, the document will be created as a child node of the given parentId in the tree.

:cross_mark: Even though I have defined the right parentId in my API request, API is called successfully, but the new documents is added to the beginning of the root tree, not the child node of my parent document
:red_question_mark: Is it a bug of backlog API or it has not been supported yet?

My payload is as below

{
“projectId”: 123456,
“title”: “Child_Weekly Meeting_123”,
“content”: “# Meeting Summary\n\n## Date: 2026-02-10\n## Attendees\n- John Doe\n- Jane Smith\n\n## Action Items\n- Review pull requests\n- Update documentation”,
“parentId”: “019b2b0cea167be9b4b5da1c173x2xxx”

}