You should "wrap" your structure in some kind of a NOP block. When the structure is merged into the world, it needs to know where to keep the original blocks - such as outside the rounded corners.
I personally use sponge, because that's a block that still exists in MC but isn't used anywhere at all.
Why do people love super-dark screenshots so much? "Wow, yeah, a black rectangle, kudos!" wtf?
I personally use sponge, because that's a block that still exists in MC but isn't used anywhere at all.
Why do people love super-dark screenshots so much? "Wow, yeah, a black rectangle, kudos!" wtf?