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This is interesting, I don't know if Reborn did it because I barely bothered going after the Z-Crystals due to how fucking annoying most of them were to get and how late into the game they're locked into, same story with Rejuvenation.
But I got Grassium-Z earlier than intended by using debug and it spawns grassy terrain after it's used, I'm not sure if it overwrites fields like the crowd and dance floor, but if it does, that's good to know for later.
