A hole in the world.
This is a minor glitch. On maps with one particular corner exposed down to bedrock there is a hole in the world. Just empty space at the corner, no bedrock. I have seen it before but due to the orbital laser droppers I got close enough to get curious and try to see what's inside it. Well, the world is just a cube with clouds and a sun and weather! You can see it rapidly receding after you fall into the hole. You never hit bottom and must reload.
It was neat with the corner falling gobs because they just zipped by.
Thanks for the quick patch!