One day I went to visit a mansion in the woods looking for evokers to get totems of immortality and when I entered I didn't see anything about evokers or Vindicators or much less Vex so I thought it was a mistake and went to a second mansion and the same thing happened to me and from there I moved away and they continued without generating anything other than surface mobs.
Do you have Mob Spawning turned off in world settings?
If not, please provide the world seed and coordinates where this occurs.
This issue is being temporarily resolved as Awaiting Response. Once the requested information has been delivered, the report will be reopened automatically.
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