When using device, android bubbles chat prevents notifications for Facebook messenger from working. It acts as if the bubble is always open (as in there is no notification because the chat is open) even when the chat is not open. Red dot by bubble to display notification also does not show. Its as if you have opened a message when you haven't.
Note this did not happen before the update to android 11 with bubble chats instead of 'chat heads'
Galaxy S10 Plus.