Ok so I went to the Butterfly Tomb area to check the spawns of the crystals. Indeed they dont match the spawn timer of 5sec, it took a few minutes for any to start spawning, but now they are spawning quite often.
The location however, does match the database. It says 1 location, but this “1 location” can be quite a large area. One example of this is at Mage Tower 4F. If you check the spawn location for Minivern, it says 1 location and shows 1 dot in the map, but if you go to the map, the Miniverns spawn all over the map. Which means this 1 location covers the entire map.
Also in regards to the whole Kateen mystery(you might already know this though): There’s a map called “Secret Room”, and it has entrances to Tenet Garden, Septiny Glen, Dvasia Peak and Letas Stream. The map layout is also unique. If I had to make a wild guess, I’d say this map has something to do with the Kateen secret. https://tos.neet.tv/zones/1142