When hitting the api for a specific post, all the data is getting returned, except the featured image, which is giving this error:

"featured_image":{"errors":{"json_user_cannot_read":["Sorry, you cannot read this post."]},"error_data":{"json_user_cannot_read":{"status":401}}}

Auth has been tested and working fine, and the user sending the request is a super-admin. This is happening intermittently, with no common factor between the posts where the error is coming up.