Issue description:

When using the Foundry Controller, a crash occurs that ruins your world.
I have been experimenting and it is with any object that can be melted, from ores, magma cream, diamond, etc. In addition to trying in different worlds.

If crashed, link to crash report (use a site such as pastebin):
https://pastebin.com/VuDmG8bJ

Versions:

Minecraft: 1.16.5
Forge: 36.10
Mantle: 1.6.103
Tinkers Construct: 3.0.4.171

Can it be reproduced with just Tinkers Construct? If not, list the other mods required to reproduce the issue.
list of the mod :

• Forge-1.16.5-36.1.0-client.jar
• TConstruct-1.16.5-3.0.4.171.jar
• forge-1.16.5-36.1.0-universal.jar
• Mantle-1.16.5-1.6.103.jar

I tested the same mods config and even put your resource pack and your games language and also your java settings my games do not crash

Duplicate of #4497, your foundry structure is invalid, but there was a bug that still allowed it to build. Likely you have the controller on the bottom layer and the second later is incomplete.

I honestly forgot that the fix has not been released yet, but you should be able to recover your world in the next alpha