Mirage was not available in a Eagon memory map

i just ran a Memory of dread map from eagon as Jungle valley with 2x Kalguuran Scarab and 1x Beyond Scarab of Invasion and the map did not have a Mirage in it. I do not know how to replicate this as it just happend for the first time to me, so it might be a very rare occurance.

Reference number: 492.744.589

Heres a recording i made with OBS of me walking through the map:
https://youtu.be/3D6bih5pJCo

i just learned that the map had the "Area is cursed" modifier and what this does, eventho i had just opened this Memory thread i got this modifier. Im not sure how or why