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You should upgrade or use an alternative browser. This might be more of an iCloud question but so far it's only on the iPhone.

I was deleting attachments from messages earlier and some entire messages, and my phone randomly deleted my entire message history with a contact. I hadn't been deleting anything from this contact's messages, which is why it's so weird. It also removed them from the Pinned section in the message inbox, temporarily then restored them.

Weirdly, the entire message history is still on my iPad despite manually forcing the message sync on both devices multiple times.

Because the phone removed this person and then put them back, I am still a little hopeful it will all be restored. But it's been a couple of hours now so it's unlikely - but I feel like it must be a software glitch as its device specific, for now at least.

Does anyone know what may have caused it and if there's a way to restore the messages?