I attached recording with this. In most cases this happens when I have a new chat with some new messages. (Usually these are spams from unknown). When I click on the chat to show the content, the little cross icon disappears and the chat cannot be closed. I have to click on a different chat and move mouse pointer back and the cross is there again and I can close the chat. So, this is not really a huge problem, just a minor annoyment.

CleanShot 2020-03-23 at 14.05.46.mp4