What I was doing, was I was mining underground near bedrock.
I was coming out of one of my tunnels expecting nothing unusual.

But then what actually happened was my Minecraft player's sight turned black as it
should when a block falls on a player. I then stepped away, and turned to look for the block that fell on me,
but there was nothing there.

Steps to Reproduce:
1. Start mining at the first layer of bedrock in 1x2 block corridors.
2. Carry on mining until your inventory is nearly full.
3. When you inventory is nearly full, head back up.
4. Start repeatedly going to the surface and going back down again.
5. When back down at the corridor, it should then happen.