Steps to reproduce:
1. Breed villagers until you get two cartographers
2. Trade with the cartographers until they each have a Woodland Explorer available for trade (make sure they are different # maps)
3. Trade for the Woodland Explorer maps
Expected results:
Each Woodland Explorer map is unique
Actual results:
Woodland Explorer maps, despite having unique numbers (in my case #64 and #69) appear to be identical (see screenshots attached)
World seed number: -6546044224551629769
This is on a hosted realm which was created September 4th 2014, which was Minecraft version 1.8 (I believe).
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WAI

Mojang completely screwed up with Mansions generation and the mechanics of Cartographer maps...
We have a world that is nearly 200-300 GB's large and only has 3-5 mansions in it. And that's after doubling the radius of the world border with the update...
Cartographers keep selling maps to a Mansion far out of the world border and the only way to reset the map is to fill out the previous map. Which is impossible because it's out of the world boundary...
Given the rarity and impossibility of resetting maps that are sold. This whole portion of the update was a monumental screw up.Our server has about 50+ players how is 5 mansions enough?

The mansions are supposed to be extremely rare, /locate only finds a new mansion after teleporting ~30000 blocks away and cartographer maps are basically a /locate command (nearest structure only).

Well I think it's foolish spending a lot of time working on an update that 90% of people on our server will never get to experience.
Imagine larger servers with 100s of players.
Worthless update.