Forge - 1.12.2 14.23.0.2489
Chisel - 1.12.1-0.0.14.18
Quark - 1.3-110
AutoRegLib - 1.3-13

Upon starting the server with the above mods, Chisel spams a bunch of errors regarding quark IMC data

https://gist.githubusercontent.com/bloodmc/fc9529179488b075ad94b7d190051f2d/raw/d086a7b4896221068baeffc25f4a0c5d01015ccb/chisel_errors.txt

[Server thread/ERROR] [Chisel]: Could not handle data {id:"minecraft:air",Count:1b,Damage:0s} for IMC type ADD_VARIATION_V2. This was sent from mod quark.
!! This is a bug in that mod !!

I have the fix noted on #646, so I'm closing this.