Additional black square in void

Maybe relates to:

• MC-3230
• MC-45067 (reason for that report)

The bug

When you are in the void and press F5 once, you can see an additional black square. I don't know if this is intended, but I don't see any use for this.

How to reproduce

1. Press F5 once
2. Start flying in creative mode
3. Use this command:

   /tp ~ -64 ~ 90 -50
   

I guess this is the graphic which creates the effect that when you are looking up while falling in the void, you will only see a white square, but it is anyways pretty bugged