Ok so, in step order what happens:

1. I find a shipwreck/underwater ruins
2. I find a chest with a buried treasure map
3. Grab the map (with shift-left-click)
4. Notice the map isnt showing anything, even though it is named Buried Treasure Map
5. I right click the map thinking it might help
6. it becomes a normal map, showing the nearby ocean
7. the map name has also changed to Map with a tagline below which says #1
8. i am now frustrated this happened twice

More info: I played on 1.18.2, i saw on reddit some others with the same problem saying its a bug but didnt find a current bug report. 

I used fabric and sodium, but it shouldnt affect this

I played on hardcore

seed: ask if needed for testing but i dont want it public

ty

below is img of the weird map after the process