function update_product_comment($comment_ID) {
    $commentarr = [];
    $commentarr['comment_ID'] = $comment_ID;
    $commentarr['comment_type'] = 'test';

    //wp_die(var_dump($commentarr['comment_type'])); <-- COMMENT_TYPE = 'TEST', SO FAR SO GOOD!
    wp_update_comment($commentarr); // <--- THE CULPRIT
}
add_action('edit_comment', 'update_product_comment');