I'm currently fixing again the bug (unicode characters), i observed most non-english characters are the ones affected, but if both english and non-english is present, usually it works but sometimes don't.
I'll give an update after two days regarding this error.
Were you able to determine the cause of this? The last broken notification I got was on December 7. After that, I haven't noticed anything unusual. Btw, apart from our language (Bangla), did any of the other members from different region reported this same issue to you? I'm only asking this because you said non-English characters!
One thing I don't quite understand is that, how come sometimes it's working and sometimes it isn't ?! I mean if something is broken, shouldn't it be broken for all!

LB, gave you a good suggestion! TryNinja might be able to help! His BTT bot doesn't have this kind of issue!