You should use the acf/save_post hook with a priority > 10
function overwrite_ratings_category($post_id){
if (is_string($post_id) && substr($post_id, 0, 5) == 'term_') {
update_field('field_630dbc7cf3fdd', '432', $post_id);
}
}
add_action('acf/save_post','overwrite_ratings_category');
This might change depending on what type of field you are trying to update. What type of field are you trying to update?