In my world the chunk including coordinates 824 77 -295 is not loaded. It is possible to fly into it. When jumping in it without flying, I'm sinking down, like in cobweb. Coming on the normal ground level I stop and it starts lagging. Over the normal ground level I'm able to shoot with my bow, under it not. When shooting on the hole from above, the arrows seem stucking in the air while actually stopping on the level of the ground, that was there. In the hole there are about 150 bats, that are also slowly sinking down. On the top, just under the earth level, some bats are hanging, but it is impossible to make them fly.
I already tried to rload the world, restart Minecraft, restart at another point, about 1 kilometre away and than flying there, nothing helped.