[1.21.1] Crash with MineColonies - Negative burn time on cgs:tank_empty / cgs:tank_water

[SergeantSapient]

Description

Minecraft Version: 1.21.1
NeoForge Version: 21.1.228
Create: Gunsmithing Version: 1.4.3
MineColonies Version: 1.1.1307 (snapshot)

Crash Summary

The game crashes during MineColonies' compatibility discovery phase because fluid tanks from Create: Gunsmithing return a negative burn time.
Stack Trace (key part):

Javajava.lang.IllegalStateException: Stack of item cgs:tank_empty has a negative burn time
    at net.neoforged.neoforge.common.extensions.IItemStackExtension.getBurnTime(...)
    at net.minecraft.world.level.block.entity.AbstractFurnaceBlockEntity.isFuel(...)
    at com.minecolonies.api.compatibility.CompatibilityManager.discoverFuel(...)
    at com.minecolonies.api.compatibility.CompatibilityManager.discoverAllItems(...)

Affected items:

• cgs:tank_empty
• cgs:tank_water
• (likely all other cgs:tank_* variants)

Steps to Reproduce

1. Install MineColonies + Create: Gunsmithing.
2. Launch the game / create or load a world.
3. Crash occurs during server tick while MineColonies scans creative tab items for fuel compatibility.

What I Tried

• Blacklisting the tanks with Item Obliterator (!cgs:tank_.*) — did not prevent the crash (MineColonies scans too early).
• Removing other mods — issue only occurs with CGS present.

Expected Behavior

Fluid tanks should return 0 (not fuel) for getBurnTime() / Fuel checks, like most other Create addons do.

Actual Behavior

Tanks return a negative value → NeoForge throws IllegalStateException when MineColonies scans them.

Log files:

2026-05-08-7.log.gz
latest.log

Additional Information

• This is a compatibility issue between Create: Gunsmithing and MineColonies.
• Item Obliterator blacklisting doesn't help due to early scanning timing.