Quickshell can't find icons

I’m trying to setup quickshell. It is QT / QML based. While it generally works, I get spammed with this in the logs and some icons are missing.

  WARN: Could not load icon "application-exit-symbolic" at size QSize(19, 19) from request
  WARN: Could not load icon "help-about-symbolic" at size QSize(19, 19) from request
  WARN: Could not load icon "application-x-addon-symbolic" at size QSize(19, 19) from request
  WARN: Could not load icon "document-properties-symbolic" at size QSize(19, 19) from request
  WARN: Could not load icon "bluetooth-symbolic" at size QSize(19, 19) from request
  WARN: Could not load icon "document-open-recent-symbolic" at size QSize(19, 19) from request
  WARN: Could not load icon "edit-find-symbolic" at size QSize(19, 19) from request
  WARN: Could not load icon "bluetooth-disabled-symbolic" at size QSize(19, 19) from request

I have some icon sets properly installed on my system, and they work elsewhere, but I can’t seem to figure out how to get quickshell to recognize them.