Messages via iCloud Restore

Just purchased a new iPhone 15 pro max, upgrading from the 14 plus. After trying to restore via iCloud backup multiple times from different backups, coming to the same conclusion that only 1% of my messages are being restored. In iCloud settings, you can see over 92gb of messages data, and clearly not all of it downloading onto the new device. I’ve tried resetting the device multiple times, enabling and disabling messages, and even multiple different backups. All with the same issue.