[1.17.1] Volume Stream copy/paste not operating correctly.

[dualspiral]

After merging api 8 into 9 (https://github.com/SpongePowered/Sponge/commit/1fc19af170d59c97fa1e6137f8d4dd22d1a2a28a), the CopyPasta plugin is not copy/pasting regions correctly. Left is the original, right is the result, note that it seems to be off by one in all directions. Copy/pasted the 2x1x2 cuboid of granite.

It's probably a botched merge, something from the old code might have merged in because of some change in the 1.17.1 branch.

@gabizou might have ideas.