I can confirm that turning off pango by setting MOZ_DISABLE_PANGO=1 in
/etc/environment fixes this issue.
The version is:
$ ldd mozilla-thunderbird-bin | grep pango
libpangocairo-1.0.so.0 => /usr/lib/libpangocairo-1.0.so.0
libpango-1.0.so.0 => /usr/lib/libpango-1.0.so.0
libpangoft2-1.0.so.0 => /usr/lib/libpangoft2-1.0.so.0
There is a patch to fix this from RedHat:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=198759
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