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  • I’m also having this issue with the ACF field not being updated in the backend (without full page refresh) using update_field($field_key, $field_value, $post_id) during ‘acf/save_post.’

        public function register_hooks()
            // add_action('acf/save_post', [$this, 'acf_save_post'], 5);
            add_action('acf/save_post', [$this, 'acf_save_post'], 20);
        public function acf_save_post($post_id)
            $post_type = get_post_type($post_id);
            switch ($post_type) {
                case 'event':
        public function acf_save_post_event($post_id)
            $field_key = 'field_6247dc975b487';
            $new_value = 'hello';
            if ($new_value) {
                //$_POST['acf'][$field_key] = $new_value;
                update_field($field_key, $new_value, $post_id);
            } else {
                //$_POST['acf'][$field_key] = '';
                delete_field($field_key, $post_id);

    I am using the field key rather than the field name. I attempted the methods under “Applied after save” and “Applied before save” at href=” This is top-level field, not under a group or repeater. It is a jQuery datepicker field, by I also attempted this with a plain text field, with the same results. The field updates properly in the database, but this isn’t reflected in the post edit screen until a full page refresh. The Gutenberg editor is active for the post type edit, so the page does not fully refresh on “Update.”

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