https://bugs.winehq.org/show_bug.cgi?id=51321
--- Comment #3 from Jactry Zeng jactry92@gmail.com --- (In reply to Rafał Mużyło from comment #2)
Might be looking in a wrong direction, but do you have 'Replacements' keys set up for the default Chinese font ?
Neither adding replacements nor copying SimSun from Windows to wineprefix does help.