Channel Post Response

Hi Guys,
I have 65 post in my channel and i call API http://your-mattermost-url.com/api/v4/channels/{channel_id}/posts?page=0&per_page=20
I got exact result but there is has_next flag is there getting false actually it would be true.
“next_post_id”: “”,
“prev_post_id”: “czaquzws63fo5b767phnc5bwmo”,
“has_next”: false,
“first_inaccessible_post_time”: 0