Minecraft Alpha 1.2.7 is a unique entry in the game's history because . While most Alpha versions are documented milestones of the game's 2010 development cycle, "Alpha 1.2.7" is widely recognized as a fan-made creepy-pasta version or a "cursed" build designed to evoke the early-internet horror surrounding characters like Herobrine. The Legend of the "Cursed" Build
To understand why there is no official "Alpha 1.2.7," one must look at the actual release timeline. The ended with version Alpha 1.2.6 on December 3, 2010, after which the game transitioned into Beta. minecraft 1.2.7 alpha
However, the "1.2.7" designation does exist in other branches of Minecraft: Minecraft Alpha 1