Mounting an entity near a wall darkens the area

When you mount an entity and it goes towards a wall, the block area turns black.

Steps to follow:

1.-Place a wall floating one block high.

2.-Place a boat near the wall.

3.-Ride the boat.

4.-Approach the wall.

Expected Result: Going towards a wall mounted on an entity should not obscure the camera.

What happens: The area goes dark.