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Sable Assembly Fix
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Fixes item duplication during Sable assembly/disassembly by preventing non-Clearable block entities from dropping their contents. Works with any mod - Keg, cabinets, baskets, Item Drains, Sophisticated Storage, etc. No configuration needed.
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Runs entirely on the server. Also works in singleplayer.
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Overview
Sable Assembly Fix fixes an item duplication bug that occurs during Sable assembly/disassembly for block entities that do not implement the Clearable interface.
The Problem
Sable's SubLevelAssemblyHelper.moveBlocks() calls Clearable.tryClear() on every block entity during the assembly process. The issue is:
- For block entities that implement Clearable (e.g. chests, hoppers) — works fine, contents are properly cleared
- For block entities that do NOT implement Clearable (e.g. TableCloth, Mechanical Arm, Ejector, etc.) — tryClear() is a no-op, nothing happens
- The block is destroyed and its items drop into the world, but the NBT data containing the item inventory is still there
- When the block is recreated in the sub-level, the NBT items are read back
- Result: the same items exist both on the ground and inside the block — item duplication
Triggering this bug is trivially cheap:
simply toggle the ship between physics mode and block mode (or vice versa) — each transition triggers assembly/disassembly, which duplicates the contents of any non-Clearable block entity on the ship. No expensive resources or complex setup required.
How It Works
A single @Redirect mixin intercepts the Clearable.tryClear() call inside SubLevelAssemblyHelper.moveBlocks() :
- If the block entity implements Clearable → passes through normally, no intervention
- If the block entity does not implement Clearable → calls level.removeBlockEntity(pos) to remove the block entity entirely, preventing it from dropping any contents
Affected Block Entities (Create + Addons)
| Block Entity | Items per dupe |
|---|---|
| TableCloth | up to 4 |
| Mechanical Arm | entire held stack (e.g. 64 items at once) |
Plus any modded BE with inventory that doesn't implement Clearable.
Note: The Mechanical Arm is especially severe — it duplicates the entire held stack in one operation. If the arm is holding a full stack of 64 items, you get 64 duplicated items per assembly/disassembly cycle. Any modded block entity with an inventory that doesn't implement Clearable is also affected.
Configuration
A whitelist system is included. The config file config/sableassemblyfix/whitelist.json is automatically created on first launch.
Add block entity IDs to the whitelist to skip the fix (e.g. if a mod handles Clearable on its own). Requires a game restart to reload.
Dependencies
- NeoForge >=21.1.228
- Sable >=2.0
- Create: Aeronautics >=1.0.2
License
MIT
Overview
Sable Assembly Fix fixes an item duplication bug that occurs during Sable assembly/disassembly for block entities that do not implement the Clearable interface.
The Problem
Sable's SubLevelAssemblyHelper.moveBlocks() calls Clearable.tryClear() on every block entity during the assembly process. The issue is:
- For block entities that implement Clearable (e.g. chests, hoppers) — works fine, contents are properly cleared
- For block entities that do NOT implement Clearable (e.g. TableCloth, Mechanical Arm, Ejector, etc.) — tryClear() is a no-op, nothing happens
- The block is destroyed and its items drop into the world, but the NBT data containing the item inventory is still there
- When the block is recreated in the sub-level, the NBT items are read back
- Result: the same items exist both on the ground and inside the block — item duplication
Triggering this bug is trivially cheap:
simply toggle the ship between physics mode and block mode (or vice versa) — each transition triggers assembly/disassembly, which duplicates the contents of any non-Clearable block entity on the ship. No expensive resources or complex setup required.
How It Works
A single @Redirect mixin intercepts the Clearable.tryClear() call inside SubLevelAssemblyHelper.moveBlocks() :
- If the block entity implements Clearable → passes through normally, no intervention
- If the block entity does not implement Clearable → calls level.removeBlockEntity(pos) to remove the block entity entirely, preventing it from dropping any contents
Affected Block Entities (Create + Addons)
| Block Entity | Items per dupe |
|---|---|
| TableCloth | up to 4 |
| Mechanical Arm | entire held stack (e.g. 64 items at once) |
Plus any modded BE with inventory that doesn't implement Clearable.
Note: The Mechanical Arm is especially severe — it duplicates the entire held stack in one operation. If the arm is holding a full stack of 64 items, you get 64 duplicated items per assembly/disassembly cycle. Any modded block entity with an inventory that doesn't implement Clearable is also affected.
Configuration
A whitelist system is included. The config file config/sableassemblyfix/whitelist.json is automatically created on first launch.
Add block entity IDs to the whitelist to skip the fix (e.g. if a mod handles Clearable on its own). Requires a game restart to reload.
Dependencies
- NeoForge >=21.1.228
- Sable >=2.0
- Create: Aeronautics >=1.0.2
License
MIT
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-
Duplication without fix Items from a TableCloth dropping onto the ground after toggling ship mode — no SableAssemblyFix installed. -
Fixed with SableAssemblyFix Same TableCloth, contents preserved correctly with SableAssemblyFix installed.
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