Howwww? Have you checked ‘Recently Deleted’? This is something I’ve never seen happen before, wow.
Try restarting, force restarting, or updating. If that doesn’t work, pray that they’re going to text you.
It’s possible that you accidentally set the ‘Keep Messages’ setting to 30 days or 1 year instead of ‘Forever.’
Can you restore from a recent backup?
New year, new iPhone, I guess.
Piper said:
New year, new iPhone, I guess.
If you switched your phone, you most likely had iMessage backup in iCloud turned off. I lost all my messages while switching for some reason. I don’t think it’s possible to get them back. Try Apple Support.