Incident: Activity badge display issue

From 1:50 PM PDT on September 9, 2025, until 7:46 AM PDT on September 12, 2025, some users had an issue where the Activity tab in Slack would show an unread count badge even when there was no new activity.This was caused by a recent backend change that unintentionally prevented unread badges from clearing. We've rolled back the problematic code and pushed out a fix. All affected users should no longer run into this issue. Should any users still be experiencing this, please hard refresh your client (Cmd/Ctrl + Shift + R).