Notifications received from chats never subscribed to
Since very recently, I'm frequently receiving notifications from chats I have never subscribed to. To be more specific, I'm getting notifications from the "Arch Linux" and "Debian" rooms and I'm sure I have never signed up to either of them in the past. If I click on the relevant notification displayed in the notification panel on the top bar of the Ubuntu touch phone, I receive a message to join to one of the mentioned rooms, but obviously I'm not interested to.
Matteo