As world generated, every chunk was different, it seemed to be 2 biomes mixed in a checkered pattern. Can't really explain it, see pictures for better explanation.
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Can you tell the seed and location?
Might be related to: MC-125037

Does MC-315 describe the same issue?

Yeah, the seed is -2150243766744477127
and it is right at the spawn chunks or -96 64 238

I also took a look at those two bugs and they seem to be different than this one but most similar to MC-125037