Strange black space of nothingness

twice in my world in 0.7 i have seen just black spaces of nothing where something should be like in the middle of the road or the wall and floor of a house like so

i can walk on it no problem but it removed the walls and anything else there.

I’ve had that happen too. If you examine it its a nothing/none.

It’s a map generation bug. The developers have been working on fixing it.