Comments are not visible on Jira UI which are added using API under Timeline section of Incident

I had created/added Comments using API for issue in Incident management project of Jira.
but these comments are not visible on jira UI.
when I tried to get issue information using API(/rest/api/2/issue/{issue_Id}), I am able to see all comments which I created using API, but these comments are not visible on UI.
API used to add comments to issue:
“body”:“this is a test comment”.
As a response, I am getting StatusCode=201 and in body comment details like self URI, author, body, and updateAuthor.

Please suggest is there anything else required to make comment visible under incident management project issue?