2.2.10 on moodle 3.10 doesn't show non-latin characters at all

[cygnus-dawn]

Yes I read all these references about the issue: https://moodle.org/mod/forum/discuss.php?d=222296 https://docs.moodle.org/32/en/Simple_certificate_module#Languages_with_special_character https://github.com/bozoh/moodle-mod_simplecertificate/issues/5

My html markup is: <span style="font-family: freeserif;">测试</span>

Yet they still show up as unknown placeholders.

The test was in Chinese Simplified and your forums and documentation did not help. Yes I have freeserif.php in lib/tcpdf/fonts/