Hey Ian, thanks for the updating the report. I don't have the answers to
all your question and I'm unsure we have someone in desktop who is
expert with fontconfig or fonts to reply to e.g the first one

I can reply to at least one though!

> * Can someone explain exactly what things the `dpkg-reconfigure
fontcache` command calls to build the cache? is it sufficient to just
call fc-cache from the fontconfig package or do we need to be doing
something else too?

$ cat /var/lib/dpkg/info/fontconfig.postinst 
...
  # Force regeneration of all fontconfig cache files.
  mkdir -p /var/cache/fontconfig
  printf "Regenerating fonts cache... "
  fc-cache -s -f -v 1>/var/log/fontconfig.log 2>&1 || (printf "failed.\nSee 
/var/log/fontconfig.log for more information.\n"; exit 1)
  printf "done.\n"


that's what the fontconfig package is doing

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

Title:
  snapd generates incomplete fontconfig caches, result in emoji
  rendering issue in chromium

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