Announcement channels stopped accepting everyone’s messages

August 5, 2026

An announcement channel was an ordinary channel wearing a different icon: the write guard read the channel type and then checked only whether the channel was archived. Anyone who could post at all could post in it.

The check now sits on the message-create path only, deliberately. Putting it on the shared guard would have made announcement channels unreadable and un-markable-read for everyone who cannot post in them — a worse defect than the one being fixed.