Chunks unrender when they can be observed

I have put 16x16 walls at chunk borders and noticed that chunks behind that wall wont render depending on your position and head rotation. This happens in 1st person and 3rd person.
I had single chunks , strips and large areas not rendered when experimenting.
Chunks behind the walls along the x-axis never rendered when viewed from the right direction.

Blocks and Entities dont render making the glowing effect useless in that scenario.
I was also able to show that chunks dont render when they leave your FOV by looking down, again making the glowing effect useless.