Checked for existing issues

• I have checked for existing issues, and have found none.

Tested latest version

• I have checked that this occurs on the latest version.

GregTech CEu Version

1.4.6

Minecraft Version

1.21.1

Recipe Viewer Installed

None

Environment

Dedicated Server

Cross-Mod Interaction

No

Other Installed Mods

Reproduced with only GregTech Modern

Expected Behavior

It should be possible to place coal in the fuel slot of a Low Pressure Steam Solid Boiler

Actual Behavior

Coal can not be placed in the fuel slot.

Steps to Reproduce

Place a Low Pressure Steam Solid Boiler, right click, try to place coal in the fuel slot

Additional Information

when opening the gui, it throws the following error on the server:

the error was unrelated