Odd block placement behavior when breaking and placing at the same time

When the player breaks a block and attempts to place a block against it at the exact same time the block gets directly replaced with the block that was attempted to be placed, even if there was no other block to place the new block against for it to be placed in that position.

Here's a video demonstrating this. While it doesn't break anything, it's rather strange for this to happen, given that the player essentially placed a block in thin air.