Post metadata deletes itself

I’ve been using this for a while to solve exactly your issue, I think I got it from the codex somewhere. But it works.

// verify if this is an auto save routine. 
// If it is our form has not been submitted, so we dont want to do anything
    if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE )
        return $post_id;

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