I tired to figure out what exactly happens when I reinstall fonts-noto-
color-emoji.  According to dpkg's output, fontconfig's triggers run.
fontconfig's postinst runs

  # Force regeneration of all fontconfig cache files.
  mkdir -p /var/cache/fontconfig
  fc-cache -s -v 1>/var/log/fontconfig.log 2>&1 || printf "fc-cache 
failed.\nSee /var/log/fontconfig.log for more information.\n"

when triggered.  I looked at /var/log/fontconfig.log, and I see a lot of
"skipped" messages for various directories (because "existing cache is
valid" or "looped directory detected"), and then I see

  /var/cache/fontconfig: cleaning cache directory
  /var/cache/fontconfig: invalid cache file: 
0bd3dc0958fa2205aaaa8ebb13e2872b-le64.cache-7
  fc-cache: succeeded

Now I'm wondering how a fontconfig cache file becomes invalid, and how
do other applications cope.

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https://bugs.launchpad.net/bugs/1858636

Title:
  [snap] color emoji not rendered; many bw emoji rendered as boxes

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