require('wp-blog-header.php'), wp, WP->main, do_action_ref_array('wp'), WP_Hook->do_action, WP_Hook->apply_filters, RankMath\Replace_Variables\Manager->setup, RankMath\Replace_Variables\Post_Variables->setup_post_variables, RankMath\Replace_Variables\Post_Variables->get_post_thumbnail, has_post_thumbnail, get_post_thumbnail_id, get_post_meta, get_metadata, get_metadata_raw, apply_filters('get_post_metadata'), WP_Hook->apply_filters, R\post_thumbnail_id, get_field, acf_maybe_get_field, acf_get_meta_field, acf_get_field, apply_filters('acf/load_field'), WP_Hook->apply_filters, _acf_apply_hook_variations, apply_filters_ref_array('acf/load_field/name=featured_image'), WP_Hook->apply_filters, R\load_featured_image, R\get_post_type_behaviour