The player (me) flies in a superflat world and, as they are flying, the superflat world suddenly disappears and takes away.

The player (me) flies in a superflat world and, as they are flying, the superflat world suddenly disappears and takes away, even dirt and bedrock, blocks. The player exits out of the world, reopened it, and found all his redstone and creation work to have disappeared. After reopening Minecraft, the world was fine. It was a disturbing bug, however. I do not have any pictures of the events, for i was in shock when this occurred. The use of command blocks were used. Teleportation commands, a few about 20, command blocks were used, and many were completing a function at the same time, possibly causing lag.