https://old.reddit.com/r/iphonehelp/comments/1ju1q9t/missing_map_locations_when_viewing_my_iphones/moo5euf/ gave me the answer which is weird/odd: "Had the same issue , I am on 16 Pro Max running 18.4.1 . If you have Require Face ID to open the Photos app, that is the cause for the photos not showing location when you swipe up.
Long press the photos app and tap “Don’t Require Face ID” , close and reopen app, now your photos should show location data on map when you swipe up on a photo.
Hope this helps! …"
It sounds like a bug to me so I asked this user and others to report it to Apple. I will report it too soon.