Fill command fills a chunk with ghost blocks

First off, I only encountered this glitch on this snapshot. It was only one chunk affected, and it would say that all blocks were filled.

The fill command used was: 

/fill 64 56 192 191 56 319 minecraft:black_concrete

If you want any additional information or the world I was in, please feel free to reach out to me, and I will provide it.

I was making a map wall at the time of this glitch.