Search spesific user with Search Investigation action + Bug

Hi Team,

Im using to find investigation that regarding spesific user given as a input but I cant use field “name” because there is a bug when I try to use name field, workflow brings workflow name and I created workparameter to fix that. Anyway, now Im trying to find investigation related specific user but it not working. Also, I tried API with actor_user_name field and it didnt bring data for user. Is there a any idea for that?

I did it for asset btw. When I use “$workflow.[b]” field operator:“contains” value:“pc01”, it works.
$workflow.[b] = name