Cartographers, if they are in the end or nether, refuse to give maps to water temples or wood mansions. They get stuck at the map trade. I have traded with two of them for a long time without any of them unlocking past the blank map trade.
Comments 4
Keeping it open, as it can be changed to make the villager look in overworld only.
(PS: same applies to classic superflat, which I can understand, as it has no mansions/monuments)
I think it's WAI as there is no Ocean Monument or Mansion to make exploration maps for in the End (or Nether).