Mesas are rare, and there are none in the world border. This should be fixed.
So, are we saying this was an issue and is now fixed and we HAVE a mesa biome? Because I'm looking on the Dynmap and I don't see one... yet.
Not yet - just increased the radius of the world border to 8000 blocks and it's doing its auto-generation now. Hopefully there's a mesa
Haven't really taken a look at the map since you replied, but do you know if there is one now? I'm curious :3