this is a bug in lemmy-ui. it works in alternative interfaces, e.g. at https://t.lemmy.world/c/%D8%A5%D8%B3%D9%84%D8%A7%D9%85.
the bug report about this was just recently closed due to a lack of external contributions to address the issue: https://github.com/LemmyNet/lemmy-ui/issues/2207
took a bit while reviewing this but the user is banned now.
unfortunately this is probably only the tip of the iceberg, and most of these accounts we never even see reports about. it's also pretty hard to follow/authenticate accusations once they move the conversation off the platform. while lemmy is obviously not a good place to have private conversations, it does make reviewing such cases so much more difficult, which is most certainly also the reason they push for another platform quickly.
fyi @chosensilence@pawb.social @SendMePhotos@lemmy.world