Before applied patch [1] I used a hack to override shepherd package:

    (module-set! (resolve-module '(gnu packages admin)) 'shepherd shepherd-patched)

Now on Guix commit eb6b061 I cannot use the previous override, and also
the mentioned in [1] way overriding shepherd package doesn't work:

    (shepherd-root-service-type config => (shepherd-configuration
                                           (inherit config)
                                           (shepherd shepherd-patched)))

I got error about undefined ‘#:supplementary-groups’ which added in
‘shepherd-patched’, so I assume my ‘shepherd-patched’ package not used.

[1] https://issues.guix.gnu.org/46043