Put the summary of the bug you're having here

What I expected to happen was...:
Mobs inside a stone building would not be visible

What actually happened was...:
I can see mobs through the stone

Steps to Reproduce:

1. Create a stone building without windows. In my case a mob grinder about 30 blocks above ground

2. Move away from the building. When you are just past the draw distance for the building, the stone is no longer visible but the enclosed mobs can be seen.

3. The effect is more pronounced when viewing the area from near the edge of the screen.