Abyss in Mirage but it's blocked on Atlas Tree

Abyss is blocked on my Atlas Tree, as it has been nearly all league long. Just encountered a Mirage where there was an Abyss in it. I haven't done Abyss in Mirages before, but assuming it works like Shrines, or Heist, or Essences (non Calcification), it should mirror the exact location of the mechanic. In the real map, there was no Abyss there (didn't get a photo of it), but obviously in the Mirage it was present.