Hello, I made a custom modpack for
Minecraft 1.20.1 forge 47.2.0
and I can't join my server, everything starts, but it throw an error when I log to my server, it seems to be related to connectivity + packetFixer :

[19:20:03] [Netty Client IO #2/WARN] [co.co.Connectivity/]: Packet not registered: ClientboundLoginDisconnectPacket
[19:20:03] [Netty Client IO #2/WARN] [co.co.Connectivity/]: Packet:ClientboundLoginDisconnectPacket 
[19:20:03] [Netty Client IO #2/WARN] [co.co.Connectivity/]: Packet data:
{
  "f_134809_": "translation{key='disconnect.genericReason', args=[Internal Exception: org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError: An unexpected critical error was encountered]}"
}

PacketFixer is on v1.2.0.

Here's the debug log from the server :
debug.log

Hello, I made a custom modpack for Minecraft 1.20.1 forge 47.2.0 and I can't join my server, everything starts, but it throw an error when I log to my server, it seems to be related to connectivity + packetFixer :

[19:20:03] [Netty Client IO #2/WARN] [co.co.Connectivity/]: Packet not registered: ClientboundLoginDisconnectPacket
[19:20:03] [Netty Client IO #2/WARN] [co.co.Connectivity/]: Packet:ClientboundLoginDisconnectPacket 
[19:20:03] [Netty Client IO #2/WARN] [co.co.Connectivity/]: Packet data:
{
  "f_134809_": "translation{key='disconnect.genericReason', args=[Internal Exception: org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError: An unexpected critical error was encountered]}"
}

PacketFixer is on v1.2.0.

Here's the debug log from the server : debug.log

Test this version: PacketFixer-1.2.0.1-1.20.1.zip

Fixed in 1.2.1

Yes, everything works fine, thank you

Is there a benefit to running both of these mods? They both modify network and packet things, so I would have thought they would purposefully interfere with each other.

Connectivity, for example, says that it's not compatible with XL Packets (and presumably XXL packets).

I'm not an expert, but in our case, without both we couldn't connect to our server.
I can't tell you why.
It was a pretty big custom modpack I made at that time (was trying to add content for different types of player).

Is there a benefit to running both of these mods? They both modify network and packet things, so I would have thought they would purposefully interfere with each other.

Connectivity, for example, says that it's not compatible with XL Packets (and presumably XXL packets).

Packet Fixer mixins should work fine with Connectivity ones. Because Packet Fixer mixins are not required (Shouldn't crash)