GTCEU team said this "wasn't their issue" and told me to install the mod I already installed (CoroUitl) to """fix""" the issue, so I am hoping this is an issue you are willing to help with, any help would be appreciated.

Environment:
Forge version 1.20.1-47.2.19
Weather2 version 1.20.1-2.8.1
CoroUtil version 1.20.1-1.3.5
Gregtech Modern version 1.20.1-1.0.18a
On Prism Launcher, no recipe viewer.

Expected behaviour was a successful launch to main menu screen, however resulted behavior was a client render crash upon startup.

debug log
debug.log

lastest log
latest.log

crash-2023-12-29_15.16.56-client.txt

The latest.log indicates you were missing CoroUtil, then you since installed it, the crash report you linked is a new issue unrelated to my mod. If GTCEU hasn't fixed that since this it might be worth posting that again over there.