Describe the bug
Make sure to include:

1. Non crash
2. Crash

3. ---

latest.log
crash-2020-03-24_23.15.43-server.txt

To Reproduce
Attention to detail is important!

1. Set up the Sluice system
2. Launch it with gravel

Meta Info

• TFC Version: TerraFirmaCraft-MC1.12.2-0.30.1.122
• Were any other mods included? Can you reproduce it without these other mods?
  Yes, other mods are: TFC - Metallum
  TFC - dynamictreestfc
  Doesn't seem to have any difference with or without them.