For example, <https://guix.gnu.org/packages/unicode-emoji-12.0/> links to <https://git.savannah.gnu.org/cgit/guix.git/tree//gnu/store/wfk1qhx56qsyyi03s98ihy9370298xfm-guix-module-union/share/guile/site/3.0/gnu/packages/unicode.scm#n64>, which 404s.
Relevant discussion from #guix: <http://logs.guix.gnu.org/guix/2020-02-04.log#175447>.
