Pasting rotated Java schematic 180 degrees in .mcstructure causes 1 block of air on X-edge

[MSpaceDev]

Describe the bug I have a script that takes in .schem files from Java, and converts them to Bedrock .mcstructure.

I have managed to get the code working for rotations [0, 90, 270], however 180 is not working. There is an air gap on the X-most edge, where my structure is cut off. It pastes air, meaning the blank structure size is correct. The Z-edge is fine. What could be causing the X-edge to be air?

To Reproduce Steps to reproduce the behavior:

1. Create new Amulet python script

import glob
from typing import List
from argparse import ArgumentParser
import shutil
import os
import sys

import amulet
from amulet.api.level import World
from amulet.api.level import Structure
from amulet.level.formats.mcstructure import MCStructureFormatWrapper
from amulet.level.formats.schematic import SchematicFormatWrapper
from amulet.api.selection import SelectionGroup
from amulet.api.selection import SelectionBox

def load_schematics(schematic_files: List[str]) -> List[Structure]:
    schematics = []
    for schematic_file in schematic_files:
        with open(schematic_file, "rb") as f:
            schematics.append(amulet.load_level(schematic_file))
    return schematics
    
def process_schematics(schematic_files: List[str], schematics: List[Structure]):
    for i, schematic in enumerate(schematics):
        # Get bounds of schematic
        bounds = schematic.bounds("main")
        x_size = bounds.max[0] - bounds.min[0]
        y_size = bounds.max[1] - bounds.min[1]
        z_size = bounds.max[2] - bounds.min[2]

        # Get basename of structure
        basename = schematic_files[i].replace(schematic_dir + "\\", "", -1)
        basename = basename.replace("\\", "_", -1)
        basename = basename.replace(" ", "_", -1)
        basename = basename.replace(".schem", "", -1)

        # Rotations
        rotations = [0, 90, 180, 270]
        for rotation in rotations:
            mcstructure_dir = os.path.join(output_dir, "structure", f"{basename}_{rotation}.mcstructure")
            mcstructure_wrapper = MCStructureFormatWrapper(mcstructure_dir)

            # Create new mcstructure file with correct bounds
            if rotation == 90 or rotation == 270:
                mcstructure_wrapper.create_and_open(platform, version, SelectionGroup(SelectionBox((0, 0, 0), (z_size, y_size, x_size))), True)
            else:
                mcstructure_wrapper.create_and_open(platform, version, SelectionGroup(SelectionBox((0, 0, 0), (x_size, y_size, z_size))), True)
            mcstructure_wrapper.save()
            mcstructure_wrapper.close()

            # Paste the schematic in the mcstructure
            if rotation == 90 or rotation == 270:
                paste_pos = (z_size / 2, y_size / 2, x_size / 2)
            else:
                paste_pos = (x_size / 2, y_size / 2, z_size / 2)

            mcstructure_level = amulet.load_level(mcstructure_dir)
            mcstructure_level.paste(schematic, "main", bounds, "main", paste_pos, (1.0, 1.0, 1.0), (0.0, rotation, 0.0))
            mcstructure_level.save()
            mcstructure_level.close()

def main():
    # Load all schematics
    schematic_files = glob.glob(os.path.join("./schematics", "**/*.schem"))
    schematics = load_schematics(schematic_files)
    
    # Place schematics & create mcstructures
    process_schematics(schematic_files, schematics)

2. Place .schem in ./schematics/category/file.schem
3. Run python script and copy new .mcstructures in ./output
4. Notice that rotations 0, 90 & 270 are correct.
5. Notice that rotation 180 is missing a single edge on the X-axis

Expected behavior The generated .mcstructure for rotation 180 includes the full structure, and does not have the single axis air gap towards the X direction.

Screenshots

Desktop (please complete the following information):

• OS: Windows 11
• Program Version: Latest Amulet-Core v1.9.17

Additional context Download .schem: https://drive.google.com/file/d/1yStCN8vAfiQXQm7wfSJiHESWKcxiuFPZ/view?usp=sharing