Bugged Chunks

This bug i found is pretty distructive. It doesn't crash your Minecraft but it makes your lovely world USELESS. I got some screenshots of it. I think it is cause of changing your render distance. Or loading an outdated world. I encounter this bug on the earlier snapshots. First time it just bugged then i deleted. This time I'll keep the world incase it can be fixed. Recently i downloaded a map for 1.8 and I loaded it on the latest snapshot. Its bugging a bit(on chunks). Then I lower my render distance, It's gone. Then after some traveling I manage to set my render distance HIGHER, Then the bug happened. World Deleted. So I revisit my main world. Oh no, its also bugging. So I lowered my render distance onto 2! No more. I hope I didn't move my RD(render distance) after that, but i want it to far, I did really change it, now the world is like the pictures on the attachment (yeah i spammed F2 )