Ahh, I see... I hope after this change we made it's working as expected? (I still haven't published it yet, sorry...) If you see any more errors or things that should be working differently, please let me know! I'm still embarrassed I forgot to put that comma character as an acceptable linebreak position...
STM should already try and stop punctuation and close-parenthesis from appearing as the first character on a row already: https://twitter.com/KaiClavier/status/1441149108744454155?s=20&t=FLRVtrizJHyAlRE... ...So hopefully that's still formatting Chinese text correctly.
If I see any strange text formatting, I'll refer back to this post, so thank you so much for the detailed explanation! It really helps a lot.