In the following thread I was actually reporting this same issue:
Which language are you experiencing issues with?
In my case with Japanese I’ve noticed problems especially when Japanese quotation marks (「」) are involved, although sometimes it responds strangely (or doesn’t respond) in sentences without it.
I think it’s a problem with the tool they use (DeepL), but I hope it gets fixed soon because it’s very annoying and creates a lot of uncertainty about whether we are understanding a text correctly or not.