My Photos are missing after upgrading to a new iPhone

I recently got a new iPhone 16 pro max, upgrading from the iPhone 14 Pro Max. I made sure my old phone was backed up fully and transferred all data across to my new phone as usual. However, I seem to be missing around 30 photos on my new device. The number of photos on my old and new device does not match. How do I fix this? Apple suggest going through my photos manually to figure out which ones are missing, as it is not at all clear. However, with around 107k photos this isn’t plausible. I’ve also tried restoring my new phone several times from back up and I’m still missing the same number of photos. All iCloud/photo settings are the same on both devices. No clue why those photos haven’t transferred or even what photos they are!

[Re-Titled by Moderator]