the error in question is

NeoForge: 21.0.61-beta[16:27:29] [main/ERROR] [minecraft/Main]: Failed to start the minecraft server
net.neoforged.fml.ModLoadingException: Loading errors encountered:

• LowDragLib (ldlib) has failed to load correctly
  java.lang.IllegalArgumentException: class com.lowdragmc.lowdraglib.CommonProxy has no @SubscribeEvent methods, but register was called anyway.

this only happens server side, client side loads up fine, ive attached the crash log with it
crash-2024-07-06_16.27.29-fml.txt

Upon further testing this seems to happen only when Gregtech is installed

the new pr does get the server to load but does not allow players to join the server, fails with this error
[net.minecraft.client.multiplayer.ClientCommonPacketListenerImpl/]: Client disconnected with reason: Internal Exception: io.netty.handler.codec.DecoderException: Failed to decode packet 'clientbound/minecraft:custom_payload'
latest.log

Fixed in Latest PR

Latest PR allows the server to load and the player to connect but crashes the client upon opening of the inventory
crash-2024-07-08_16.49.15-client.txt