I was trying to show you where you’re going wrong.
You have the wrong arguments in your function…
You have listed
function acf_save_description($term_id, $taxonomy, $args)
and it should be
function acf_save_description($value, $post_id, $field)
You are using get_queried_object()
and this may not work in an acf/update_value hook.
I was trying to show you how to get the term ID that is being updated by using the $post_id value that ACF is passing to your filter.