We just finished migrating our chat message database to new infrastructure. All your chats and messages came along — nothing was lost in the move.
The migration surfaced one bug: some of you got “An error occurred when deleting a message” when trying to delete messages sent after the switch. Same root cause could also stop forking from (or reacting to) those newest messages. A fix is deploying right now — once it lands, no action needed on your side, everything just works again.
Older messages were never affected. Thanks for the quick reports!