Forge Servers do not work with exact same mods on Kilt

[Cartrigger]

Version information

1.9.11

Expected Behavior

To join the server correctly

Actual Behavior

The client had a null pointer exception in Forge Networking

Reproduction Steps

1: Load Security Craft on both
2: Attempt to join server
3: NPE

Java version

21 (CLIENT) 17 (SERVER)

Additional information

https://mclo.gs/WPLXrZB
Server logs with

[00:57:56] [Server thread/INFO] [minecraft/ServerLoginPacketListenerImpl]: com.mojang.authlib.GameProfile@5df9558e[id=8ab23947-f5bb-46e5-8c07-c4b7339a802f,name=Cartrigger,properties={textures=[com.mojang.authlib.properties.Property@428e01ee]},legacy=false] (/192.168.2.10:58367) lost connection: Disconnected```