スレッドの返信数が1万件を超えると、タイムラインから日付が削除される

[awesomerobot (Kris)]

This is intentional to improve performance of long topics. There’s more information in this topic:

Performance improvements on long topics?

Maybe only the timeline does, and @sam already optimized that yesterday (by removing date from the timeline), which should also be covered in this topic I think.