When I am playing Minecraft, I seldomly saw that in some places, some blocks cutted into the ground, made square, deep holes and different biomes saw on the cutted pieces under the hole.
Please fix that bug in all versions of Minecraft just like in the music update in 2013, and please gave me a quick fixment of it（the problem will be fixed when Minecraft was restarted and you don't need to update it）.