This is indeed a bug. You won't even need a German/Italian save file to reproduce it.
If you set a German Pokemon to the save, PKHeX unlocks the Italian Pokedex entry and vice versa.
I just want to let you guys know I have personally looked at all of the map models in SM. There is only the two variants of Iki Town and the three unused rooms in the Player's house. There isn't any unused cave maps. Now I guess they could technically be blank maps, but I doubt that since there isn't really any blank maps in the files.
However, you could technically consider the maps for when you order a meal at the restaurants on Ula'ula Island and Poni Island unique. Those restaurants have the normal map and a special map for when a meal is ordered.
Thanks to @BLACKBIRD, in regards to the one distributed on Aug 19 and 20,
we've confirmed that the wonder card received is the exact same one as the previous one.
I'm uploading the new photos to the gallery.
Also, an interesting screen, telling you that you already redeemed it:
Kommo-o Z-move revealed at Worlds: Clangorous Soulblaze.
Here
Can hit both opponent and raise all Kommo-o stats after.
Edit: Alola Photo Club revelead by Game Informer