I woke up to a text notification, went to the app to read it and the app was blank. No messages, just the title Message at the top. The badge showed the number of unread messages and I could read it in notifications. Can’t send any messages. The send arrow is green as well as any contact I add as a recipient. I can get, send and read the messages on my watch, iPad, and MacBook Air. I am now up to engineering for a fix. Apple has not seen this happen before. Not looking for advice on fixing as we’ve done everything including wiping and restoring.