The bug

Put the summary of the bug you're having here

When I went to the temple of the sea, I was going to explore here, and suddenly there appeared a hole in the black cube. What's the matter? Please fix it for me

What I hope to happen is...

It's normal to explore (I don't have diamond armor, funny).

What actually happened is...

There are less than 20 of FPS and black cube vulnerabilities, which he has been loading constantly (see MC-131926).

Steps to Reproduce:

1.Go to a distant place (more than >800 Block)

2.This flaw is happening (50% is found)

*3.Sometimes it often crashes, even FPS is low to <10, sometimes generates >20 cubes (black cube caves copy brightness)

I have two graphs that are the loopholes that are produced as an attachment*(MC-131926 is more accurate, not your own view)*