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My little brother has found officially he weirdest minecraft bug/glitch ever. These screenshots were taken of the weirdness. There were also trees that should not have been in the area, acacia and jungle and spruce all in the same area, and many of them had no leaves. Is this glitch known to mojang/microsoft. to show you it is was not created the final screenshot has both the seed and the cords of the strangeness.
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Well, I got curious and also took a look at this seed (interesting one IMO) and although I agree that there doesn't seem to be a bug involved it's also fair to say that it is a bit of a weird seed. When you teleport to that same position and then look at the west side you'll come across a flower forest biome which actually looks like a swamp biome. That does look kind of strange, see my attachment as well, but I don't think it's a bug. It's not as if those shapes are limited only to swamps for example...
But... a peculiar seed I think, that's for sure.
(edit) PS: No trace of any terracotta suddenly appearing, I got a forest biome with trees and a lake with some lava pools. Comparable to your screenshot.
I'm betting that this was not a bug or a corrupted jar (which isn't even possible, the launcher will see that the checksum doesn't match the one on Mojang's servers and redownload a fresh jar, provided that the json file was not altered to remove the download URL) but somebody playing around with commands (e.g. /fill) - or perhaps they did use mods and you are just looking at the world with an unmodified client, which is the only way the game could generate such a weird biome (code corruption is extremely unlikely, if not impossible, to get such a result; most likely the corrupt game would simply crash). One fact that supports mods is that the biome is shown to be Plains, which the game will default to if it encounters an unknown biome in a save (for example, this post shows a mesa biome in my mod and vanilla). It is possible that the world was generated before 1.12 and the blocks were something else in the mod (note that numerical IDs are still used within the save files; this is why mods should use IDs well above any vanilla IDs if there are plans to update without having to create a new world or convert it to avoid conflicts with new vanilla blocks).
Also, the underwater Flower Forest in the unaltered seed is not so unusual; terrain can vary both above and below its base level and in 1.6.4 I've even seen Extreme Hills biomes that were mostly underwater (1.6.4 Extreme Hills have more height variation and a lower base level than 1.7+ but even the latter may still be able to dip below sea level).