As the title says, the chart rendered by zhwiki's EasyTimeline has missing characters.
What should have happened instead?:
Of course, the characters are rendered normally.
Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc:
Just like the mediawiki production environment version used by wikimedia.
T22825 : This task has solved the long-standing EasyTimeline rendering character loss problem. It seems that the font file of a certain application server is missing. It may be a reference.