When I delete a message in a private chat, it still shows in the little box with the details of the person I'm messaging with (don't be confused - this feedback was shared with me by a member of our community who was chatting with me - I wasn't chatting with myself).

As a user in a private chat, I want deleted messages to be removed not only from the main chat window but also from the conversation preview box, so that the message truly disappears and doesn’t cause confusion or privacy concerns.