litematica-extra

A Litematica extension that adds various fixes, backports, and features for versions below 1.21

Features

Automatically downgrade schematic version from V7 (Minecraft 1.20.5+) to V6 (Minecraft 1.20.4-), achieving compatibility with older versions while preserving data such as blocks, entities, and containers as much as possible
Added V6 schematic option to schematic export
Fix duplicate entity pasting when pasting entities at chunk boundaries on servers
Replace full metadata read with NBT scanner for better performance