Before Continuing:

• Always check you are using the latest version of the mods and its dependencies
• Remove known problematic rendering mods such as Optifine, Sodium and others. Do NOT report issues related to said mods
• If you are unsure which mod is the culprit.
  Disable half your mods at time until you isolate the culprit
• If you have a crash ALWAYS post LATEST.LOG below
• If the issue is about behaviors be sure to consult the WIKI first

Version-Loader

1.20.1-forge

Supplementaries Version

supplementaries-1.20-2.7.24 and supplementaries-1.20-2.7.25

Moonlight Lib Version

moonlight-1.20-2.8.81-forge

Issue Detail

Im having issues with supplementaries with:
chisel and bits (chisels-and-bits-forge-1.4.145)
Star Worm Equestrian Mod (swem-1.20.1-1.4.0)
everything loaded fine until i added supplementaries

at first try it wrote about both of them, second and third only SWEM, at 4th loaded successfully :/ (latest version)

Optional Attachment

crash-2024-01-18_22.17.57-fml.txt
crash-2024-01-18_22.15.04-fml.txt
crash-2024-01-18_22.19.47-fml.txt

successful load
latest.log

To Produce

No response

Some mod is doing something offthread on common setup event that they shouldnt do. This means that its a concurrency issue which could blame any mod that do things right because some mod is accsssing stuff offtread causing said race issue. I cant rell you which it is but its not supplementaries, i do all on main thread there

Disable all of your mods except Supplementaries & Moonlight Lib, and enable the mods one by one until you get the error. that will be your culprit.

i don't understand what the hell is happening right now, but i think iceberg and item highlighter caused crashes :/
i'll play more and warn you if something will happen