Leash becomes invisible after going a certain distance when in third person back camera perspective

*What I expected to happen was... *

leash should be visible at any distance through any perspective until the leash breaks.

*What actually happened was... *

the leash became invisible after going a certain distance maybe 4 or 5 blocks.

Steps to reproduce:

1. Make sure that the camera perspective is 'third person back'. 
2. Get a leash. 
3. Find a passive mob such as a cow. 
4. Leash the mob. 
5. Go 4 to 6 blocks in any direction.