this is actually 2 bugs in 1 

creative world in a village with my creations.

when i take my elytra and 1 firework and use them to go on Y coordinarte 643 and then i decided to go back home so that means i have to keep looking down 

first bug: i could still see the all the clouds in the render distance was only working on the Y coordinate

second bug: i landed in one of my slime builds and then the world wasn't loading i could still mobs

i pressed save and quit and then the world started loading again