Minecraft mining bug

The bug is that when you go down you place a torch and you move away 3 or 4 blocks and place the second camera of the player, you see all the places in which there are no blocks, like mineshaft, spawners, etc.

Steps to Reproduce:
1. When under a mine, dig in a straight line
2. Then place a torch and place 3 blocks in front of it
3. After that put the second camera and make it point to the rest of the back

Just in case, here is a video where the bug is executed: https://www.youtube.com/watch?v=IRUaN5RGRz8&feature=youtu.be