Java Edition Beta 1.9 Prerelease – Minecraft Wiki

Beta 1.9 Prerelease is the first pre-release for Java Edition 1.0.0, released on September 22, 2011, which adds nether fortresses, 6 new blocks including nether bricks and some variants, 5 new mobs including villagers and blazes, 4 new items including ghast tears, the mushroom island biome and some minor changes. Initially a pre-release for Beta 1.9, Mojang instead opted to delay the release of this update until MINECON 2011 and release it under the name "Minecraft 1.0.0". This decision was made

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WIP] Minecraft Wikipedia Page : r/Minecraft

So I made a world on Beta 1.9 Prerelease 3 (I downloaded it from the Wiki) and this happens : r/Minecraft