Chunk rendering issue (Important)

Please view the video attached.

The video shows the bug clearly.

This bug occurs in Singleplayer & Multiplayer. I have also tried "Optimising the world" to see if this makes any changes, however it does not. This happens in multiple spots in my world(s). I have tried altering render distances, settings and all sorts and I am unsure what is causing my game to render like this on specific points in the world.

I have noticed when I break / place blocks in the adjacent chunk, it randomly updates the bugged rendering.