Extreme amount of shading entering a doorway

Model number: DL701Q

This bug can happen in creative mode and survival mode.
So I built a fancy house in Creative Mode. As normal, I added a door. I went to walk in and I saw this weird shading, more intense than normal, appear on my player.

To replicate bug:

1. Build a 1-door doorway.
2. Place door in doorway.
3. Stand under doorway after opening door.