In my vanilla minecraft world chunks of new generated land keep appearing, one two blocks away from my house. One in a village, it was a huge chunk of rock.

This image shows that a random square of water appeared on the path in my village - I added a path over it-- on the left there is a huge chunk of rock and water even with grass on top - I blew up part of it, in the process of fixing it--

I'm just worried it will end up breaking my house.