Moodle LTI advantage zero grade issue

when I am sending zero (0) grade in moodle using LTI advantage, then getting success response. But zero grades are not showing in Moodle grade book.

Also, after that when I am trying to fetch the zero grades,I am getting an empty response. Please check the sample response for your reference.

HTTP/1.1 200 OK
Date: Fri, 29 May 2020 16:50:14 GMT
Content-Type: application/vnd.ims.lis.v2.resultcontainer+json; charset=utf-8
Content-Length: 2
Connection: keep-alive
Server: Apache/2.4.41 (Amazon) PHP/7.2.27
X-Powered-By: PHP/7.2.27

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Please help me with this.