setup_postdata in “loop-handling” php file called via $.ajax

Solved by getting author, post_date, permalink & excerpt manually without setup_postdata:

        $excerpt = myCustomExcerptFunction($post, 35);
        $post->post_excerpt = $excerpt;

        // Permalinks
        $post->post_permalink = get_post_permalink($post->ID);

        // Author
        $authorObjekt = get_userdata($post->post_author);
        $post->post_author_displayname = $authorObjekt->data->display_name;
        $post->post_author_nicename = $authorObjekt->data->user_nicename;

        // Date
        $post->post_date_wpformat = date_i18n( get_option( 'date_format' ),

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