Incident: Unread badge stuck in Activity view

From September 15, 2025, at around 11:00 PM PDT, through September 18, 2025, at around 9:30 PM PDT, some users may have experienced an issue with unread items in their Activity view. Specifically, the badge indicating unread items would not disappear even after the activity was read.We traced the issue back to a recent change in how the Slack client handles the item row within the Activity view, which introduced this bug. We also determined this was related to a similar badging issue that occurred on September 11, 2025. We rolled back the problematic change, resolving the issue for all affected users.