As-is:
When a form field is set to be filled by Document Builder, that field might have a specific font associated with it. Document Builder tries to use that font for all the incoming text. However, if the font doesn't have all the characters needed (glyphs), it looks for other fonts that do, either in the PDF or a default like Helvetica. If it can't find a font that supports every character, it simply skips the text it can't render, showing only what it can. In the case of mixed Chinese and Latin/English characters, it seems the system defaults to Helvetica instead of using the PDF-provided font that supports Chinese characters.
To-be:
System can support mixed Chinese and Latin/English characters when I use generate document function. In China, all of addresses have this situation.