The Meaning of Life, the Universe, and Everything.
Nope, not rare. It's just as rare as a Forest and a Plains biome spawning next to each other. Both biomes have similar temperatures so that's why they spawned next to each other.
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Devout 1.6.4 player, since 2013.
Long-Term World 1 March 22nd, 2013 – 2016; Minecraft: Pocket Edition 0.6.1 – 0.15.7 Long-Term World 2 2018 – 2019; Minecraft for Windows 10 1.2.11 – 1.12.0 Long-Term World 3 February 15th, 2020 – Present, keeping this world for as long as possible; Minecraft: Java Edition 1.6.4
I play in the long-term, where most of my projects take a long time:
End Mining Project (Mine the entire End): 6 months
2km Long Overworld Rail From Spawn to Base: 2 months
Base Expansion Project: 1-2 months (estimate) (ongoing)