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FF Wiki
When returning to Midgar on Disc 2, Aeris comes into view on the flower bed, but flickers and disappears when the player moves across a certain spot on the ground, or attempts to leave the church. Moving across the spot on the ground when approaching the scene cancels the event permanently, as Aeris's appearance is a one-time-only event. It is actually possible to move next to her if the player moves past the spot next to the broken pew before the location fully loads. In this case Aeris will not disappear, but she cannot be interacted with. The two kids' dialogue is different while Aeris is on the screen, and changes after she has disappeared when the player moves across the designated spot. The player can only have the first set of dialogue if they use the aforementioned trick of moving past the spot that makes Aeris disappear before the area has fully loaded.