i notice that alot of terrain generation is going wrong, eg there are alot of world borders and "rare biomes" no longer rare (ie mesas and jungles generating next to each other) and the terrain is a jumbled mess and all completely random. and biomes are just put next to each other with no joining together this all in worlds entirely generated in 14w25a. as all seen in attachments.
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I am not sure if this is related but I spawned my world in 14w21b (I think) and it has a HUGE (like over 800 blocks) Jungle and I haven't seen a desert or mesa at all in several thousand blocks in several directions. Seed: -8486135690963921930
I am currently running 14w25b
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We can't fix the issue unless a seed is posted for the world pictured in the screenshots. Also, @Luke Brazier, did you create a world, delete it, then create a new world with the same name during the same run?
kumasasa