Here is the complete context regarding that version string:
It is important to clarify that in the game's release history . The official Alpha 1.2 branch ended with Alpha 1.2.6 , which was the final version of the Alpha stage released on December 3, 2010 [23]. minecraft 1.2.7 alpha
(released in 2017 to fix bugs), the "Alpha 1.2.7" referenced in online lore is a horror-themed modification. The Legend of Alpha 1.2.7 Here is the complete context regarding that version