This time I successfully resurrected color emoji by manually removing the file that fc-cache used to complain about. Or, rather, I moved it aside, for study:
sudo mv /var/cache/fontconfig/0bd3dc0958fa2205aaaa8ebb13e2872b-le64.cache-7{,.bork}
Then I restarted Chromium and emoji are now colorful again.
This time I successfully resurrected color emoji by manually removing the file that fc-cache used to complain about. Or, rather, I moved it aside, for study:
sudo mv /var/cache/ fontconfig/ 0bd3dc0958fa220 5aaaa8ebb13e287 2b-le64. cache-7{ ,.bork}
Then I restarted Chromium and emoji are now colorful again.