Prophecy "Lost In The Pages" not triggering after certain maps removed from the game

Got this prophecy recently and there doesn't seem to be a way to trigger it in maps now that the map "academy" got removed from the atlas.

The prophecy reads "You will track down a powerful Undying Archivist in a map who will drop a unique item when slain." and should drop an Astramentis.

Am I missing something or is this unintended?

Try Olmec's Sanctum.

I tried running a few olmecs but it still didn't seem to proc, however I did find some undying archivists in the bottom right of the map, but they were all white mobs and none were rare mobs so it couldnt complete. Thanks for the suggestion.

Haunted Mansion is another possibility, plus some Vaal side areas.

Ran a few haunted mansions earlier, even rolled more rare monsters map affix but the prophecy doesn't seem to proc their either :/, finding a random vaal side area with the mob also doesn't seem very realistic.

The specific Vaal side area is called "Sealed Repository"

Recently spammed vaal fragments in the map device till I found sealed repository, and the undying archivists did spawn but there was a similar problem as with olmec's sanctuary as they were all of white rarity. Looking like this prophecy isn't completable.