Xlua中Dispose()释放报错委托回调问题

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public delegate void LuaFunction_();
[GCOptimize]
public struct LuaBootstrap
{
public LuaFunction_ Start;
public LuaFunction_ Update;
public LuaFunction_ OnDestroy;
}

public class Bootstrap : MonoBehaviour
{
private LuaBootstrap bootstrap;

void Start()
{
    XluaEnv.Instance.DoString("require('Bootstrap')");
    bootstrap= XluaEnv.Instance.Global.Get<LuaBootstrap>("Bootstrap");
    bootstrap.Start();
}
private void OnDestroy()
{
    bootstrap.OnDestroy();
   
    bootstrap.Start = null;
    bootstrap.Update = null;
    bootstrap.OnDestroy = null;
   
    // 最后释放 LuaEnv
    XluaEnv.Instance.Free();
}  

上面是一个简单的生命周期代码
我不知道为什么,我如果在OnDestroy方法执行一次bootstrap.OnDestroy();哪怕后续将他设置为null,在回收还会报错
(上面执行 bootstrap其他委托在设置null还是会报错,Free()方法是单例类里的释放xluaenv方法,无其他逻辑)

报错内容为:
InvalidOperationException: try to dispose a LuaEnv with C# callback!
XLua.LuaEnv.Dispose (System.Boolean dispose) (at Assets/ThirdParty/XLua/Src/LuaEnv.cs:424)
XLua.LuaEnv.Dispose () (at Assets/ThirdParty/XLua/Src/LuaEnv.cs:393)
XluaEnv.Free () (at Assets/Script/Tool/XluaEnv.cs:39)
Bootstrap.OnDestroy () (at Assets/Script/Bootstrap.cs:40)

Lua源码:
Bootstrap={}
function Bootstrap.Start()
print("Lua:Start")
end
function Bootstrap.Update()
print("Lua:Update")
end
function Bootstrap.OnDestroy()
print("Lua:OnDestroy")
end

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请大佬帮我解惑,这个代码是我跟一个很老的教程学习的xlua使用方法,我并不知道这个使用方法目前是否已经过时