evil-ex-substitute not updating counters

[hotpxl]

I read about a previous issue #7 and I have the exact same problem. Currently my config file is like:

(with-eval-after-load 'evil
  (require 'anzu)
  (require 'evil-anzu)
  (global-anzu-mode t))

Evil search (/terms) work but substitution (:%s/a/b/gc) not. It looks to me that evil-anzu is only advising "find" and "search" functions. So I don't see how this will work anyway?