Asta.CfeeLowVersionFix

Asta.CfeeLowVersionFix is a BepInEx compatibility plugin for Lethal Company that makes CoordinateForEasterEggs work on lower versions where it would normally only work on higher versions.

The original mod can crash on some older game/mod combinations after StunGrenadeItem.SetExplodeOnThrowClientRpc(bool) when it tries to send an extra custom ClientRpc. If that RPC is not registered on the target version, the game can throw a KeyNotFoundException.

This fix avoids that path and generates the visual egg line locally on the client using data the game has already synchronized.

In short, this project exists to bring a higher-version-only mod behavior down to lower-version environments.

Goal

The purpose of this project is not to replace CFEE.

Its job is to keep the original mod usable on lower versions by removing the fragile version-dependent RPC path that breaks there.

What It Fixes

This project makes CFEE usable on lower versions by stopping crashes in a flow like this:

1. StunGrenadeItem.SetExplodeOnThrowClientRpc(bool) runs.
2. The original CFEE patch calls EggLineSync.Instance.EggLinesClientRpc(...).
3. A lower-version environment does not have that custom RPC registered.
4. Netcode lookup fails and the game throws.

Instead of relying on the extra custom RPC, this fix:

• blocks the original EggLinesClientRpc(...) path
• blocks the original SetExplodeOnThrowClinetRPCExtension(...) path
• listens to SetExplodeOnThrowClientRpc(bool) directly
• calls the original CFEE GenerateEggLine(Vector3, bool) locally through reflection

Behavior

At runtime, the plugin:

• installs Harmony bypass patches over the original CFEE network extension methods
• keeps the base game RPC flow intact
• generates the egg line locally after the stun grenade receives its explode state
• regenerates the indicator when the grenade is picked up again

This keeps the effect visible without depending on a custom networked RPC path.

Requirements

• Lethal Company
• BepInEx 5
• CoordinateForEasterEggs installed

This plugin has a hard dependency on the original CFEE mod and does nothing on its own.

Plugin metadata:

• GUID: asta.cfee.lowverfix
• Name: CFEE Low Version Fix
• Version: 0.1.0

Installation

1. Install the original CoordinateForEasterEggs mod.
2. Build this project or use the compiled DLL.
3. Put CFEELowVersionFix.dll into your BepInEx plugins folder.
4. Launch the game.

Default build output:

• src/bin/Debug/netstandard2.1/CFEELowVersionFix.dll

Build

Project file:

• src/Asta.CfeeLowVersionFix.csproj

Build command:

dotnet build src\Asta.CfeeLowVersionFix.csproj

Development Notes

The .csproj currently references Lethal Company assemblies from the default Steam install path:

• c:/Program Files (x86)/Steam/steamapps/common/Lethal Company/Lethal Company_Data/Managed/Assembly-CSharp.dll
• c:/Program Files (x86)/Steam/steamapps/common/Lethal Company/Lethal Company_Data/Managed/Unity.Netcode.Runtime.dll
• c:/Program Files (x86)/Steam/steamapps/common/Lethal Company/Lethal Company_Data/Managed/Unity.InputSystem.dll
• c:/Program Files (x86)/Steam/steamapps/common/Lethal Company/Lethal Company_Data/Managed/Unity.TextMeshPro.dll
• c:/Program Files (x86)/Steam/steamapps/common/Lethal Company/Lethal Company_Data/Managed/UnityEngine.UI.dll

If your game is installed somewhere else, update the HintPath values in the project file.

Project Layout

• src/CfeeLowVersionFixPlugin.cs: plugin entry point
• src/OriginalCfeeHooks.cs: CFEE bypass hooks and reflection-based access to GenerateEggLine
• src/Patches/StunGrenadeItemSetExplodeOnThrowClientRpcPatch.cs: local egg line trigger
• LethalCompanyPatched.sln: Visual Studio solution

Limitations

• This is a compatibility workaround, not a full rewrite of CFEE.
• If the original CFEE type names or method names change, the reflection lookup may need updates.
• Runtime testing still needs to be done in-game.

Summary

The main idea is simple:

avoid the fragile custom ClientRpc + internal handler path from the higher-version implementation and reuse the game's existing SetExplodeOnThrowClientRpc(bool) signal so CFEE can still function on lower versions.