Unloading chunks

Hello, i found a bug. When i start runing or flying in my world (sandstone flat with some command blocks and redstone) chunks are unloading behind me. That's not a very big problem, because you don't see it when it's behind you. But when i run, sometimes chunks unload under me and i can see it. (attachments bug report 1 and 2). When press F5 (Thirdperson mode) i can see it much more. (attachments bug report 3,4,5 and 6) And when i press F5 ones more i see this (attachments bug report 7,8,9) But this is happening only if i look behind me. if i look a bit in the ground (under myself) it is not happening (attachments bug report 10 and 11, here you can see the difference).
I found some bug reports like this, but i think this one is more specific.