My server (hosted on my pc, I'm playing with my friends in Multiplayer) keeps getting stuck when it tries to load the world, and the last message is always about Immersive Engineering's retrogen.

I don't have screenshot but I had to delete the file "chunks.dat" in the "world" folder to play again.

Neither Minecraft nor the server crashed. Only the server got stuck. I only tried to start it after I closed it yesterday.
It happens everytime I start the server without deleting "chunks.dat".

Versions:
Forge 40.1.20 - 1.18.2
IE 8.0.1-147

The modlist is included in Direwolf20's latest pack (v. 1.2.0) on FTB launcher.

So I'll treat this as fixed by a new release of the DW pack then.