far away blocks have strange shadow effects

Far away blocks have their edges blacked out, extremely noticeable by horizons

What I expected to happen was...:
Prior to this snapshot, this did not occur. I was expecting some lighting changes since the rendering engine was updated, but this seems unintentional.

What actually happened was...:
Several black lines on edges and corner of blocks. reminds me of a cartoon black outline shader I used a long time ago, although this cannot be the case as I was not using any resource pack or had any mods installed.

Steps to Reproduce:
1. Increase render distance if not noticeable.

Video Settings are included if they are the cause. 
F3 info visible so you can see my specs, in cases it's an issue with my card.