iMessage State Not Syncing
After waking up the computer, messages from hours ago stay unread until I click on each conversation to make the badge go away. Restarting Messages.app doesn’t fix that. Clicking on a conversation sometimes replays the messages with a “new message arrived” notification sound for each message.
iMessage stopped syncing my conversations’ unread status around the time I updated to Catalina. So I have to view each conversation on each device to clear the notification number.
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Ah it's not just me then. My favorite is when there is a icon number, but there is nothing in the list, I have to restart messages to get it to show up.
Terrible.
I had the same issue for months, but it seems to have been fixed lately as both my iPhone and MacBook Pro show the exact same unread count