I don't Know why but if i look at this angle in some cases in even different worlds. basically the chunk disappears unless i look at it directly... it's kinda bugging me

Heads up, that's not exactly what "environment" means. I'm not exactly sure what should go there, but I think it should be along the lines of your system specifications, operating system, etc.

Duplicates MC-70850

Is this an world from an older version of Minecraft if it is. These are the older chunks that you've explored.

Thanks.