I believe it’s a problem of the snapshot daemon without proper Chinese font.
Google Noto Fonts could be a safer choice. (https://www.google.com/get/noto/) More specifically, Noto CJK Fonts. (https://www.google.com/get/noto/help/cjk/)
Maybe Emojis also need to be seen on thumbnails, but I don’t have any choices good enough (Apple certainly is not happy with the universal Apple Color Emoji fonts).