Generated factory loot tables reference unregistered mekmm items on 1.4.1 #250

Checked for existing issues / 已检查现有问题

• I have checked for existing issues, and have found none. / 我已检查现有问题，未发现相同报告。

Tested latest version / 已测试最新版本

• I have checked that this occurs on the latest version. / 我已确认此问题在最新版本中出现。

Mekanism MoreMachine Version / Mekanism MoreMachine 版本

v1.4.1

Mekanism Version / Mekanism 版本

v10.7.19.85

Minecraft Version / Minecraft 版本

1.21 NeoForge

Environment / 环境

Multiplayer - Dedicated Server / 多人游戏 - 专用服务器

Cross-Mod Interaction / 跨模组交互

Unsure / 不确定

Other Installed Mods / 其他已安装模组

All The Mods 10 (ATM10) modpack.
Mekanism Generators 10.7.19.85 and Mekanism Tools 10.7.19.85 are also installed.

Expected Behavior / 预期行为

Mekanism MoreMachine's generated block loot tables should reference items/blocks that are registered in the runtime registry, and datapack loading should complete without Unknown registry key errors for mekmm factory variants.

Actual Behavior / 实际行为

During dedicated server startup, many generated mekmm:blocks/_factory loot tables fail to parse because their referenced mekmm:_factory item registry keys do not exist.
For example:
mekmm:blocks/creative_rolling_mill_factory
fails because:
mekmm:creative_rolling_mill_factory
is reported as an unknown item registry key.
The same pattern occurs across many factory types and tiers, including rolling mill, stamping, planting, lathing, recycling, dissolving, liquifying, pigment extracting, and others.
The server continues startup despite the errors.

Steps to Reproduce / 重现步骤

1. Install Mekanism 10.7.19.85 and Mekanism MoreMachine 1.4.1 on Minecraft 1.21.1 NeoForge.
2. Start a dedicated server.
3. Observe datapack/loot-table loading during startup.
4. Numerous mekmm:blocks/*_factory loot tables fail with Unknown registry key in ... minecraft:item.

Additional Information / 附加信息

This may be related to #245 because the versions are identical and that issue also involves missing factory registrations. However, #245 specifically reports dense_lathing_factory, while this server produces the same missing-registry pattern across many generated factory loot tables and factory types.
I also checked the current 1.21.1 branch after merged PR #243. PR #243 fixes several factory/upgrade/recipe issues, but I could not identify a change there that addresses these generated loot tables or the broader missing factory item registrations.
I can provide the complete dedicated-server log if needed.