Found behavior (Windows 10): MM-client is in the background (e.g. when reading stuff in another window) and I receive a direct message, then the red dot in the tray appears just to disappear directly after, IF the last opened channel was the one where I got the message. Somehow the app doesn't recognize that it is not in focus and thinks the message has been read.
Due to this we missed some communication as we "lose" red circles indicating new messages. Tried several notification-configurations but no luck so far.
Thanks a lot for helpful ideas or a fix!