In the List all icons in an icon set endpoint, the "query" param doesn't seem to work

Hey, I was trying to use the query parameter to search within icons in an icon set, using the API description on this page:
https://developer.iconfinder.com/reference/list-all-icons-in-an-icon-set

However, it looks like, no matter what I put into the "query" parameter, it doesn't change the output. In other words, search doesn't seem to work even though the doc says it should. Is this a bug in the API endpoint description, or a bug in the API itself? Thanks!