[Mod Utils] Gives malformed result

[Snownee]

I am trying to use Mod Utils to export the shape of this model, according to the help page:

dark_wall_base.zip

And here is what I got: (notice the semicolon in the middle there)

VoxelShapes.join(VoxelShapes.join(Block.box(5, 8, 0, 16, 13, 16), Block.box(3, 13, 0, 16, 16, 16), IBooleanFunction.AND), Stream.of(
Block.box(5, 8, 0, 16, 13, 16),
Block.box(3, 13, 0, 16, 16, 16),
Block.box(2, 0, 0, 16, 8, 16)
).reduce((v1, v2) -> VoxelShapes.join(v1, v2, IBooleanFunction.OR)).get();, IBooleanFunction.OR)