Hello, in my server, I found out a bug: when I place the grinder, the server crashes. I also tried to follow the tips you gave other users before (upgrade Forge, CoFH Core, Sponge), but it doesn't work either.
Crash Report of the Official Server: https://hastebin.com/oyoqejunih.rb
Crash Report of the Test Server: https://hastebin.com/geqagekesa.scala

This has been addressed in SpongeForge and can be closed.