The parameter passed by xpcall is nil

[CNicer]

GopherLua v1.1.0
go v1.21.0 linux/amd64

I defiend a global function called testfunc in lua, testfunc calls function test through xpcall and passes in a parameter, but the fucntion called with xpcall displays Msg as nil, but pcall is normal

lua code:

function _G.testfunc()
    xpcall(test, debug.traceback, "Hello World")
    pcall(test, "Hello World")
end

function test(Msg)
    if Msg == nil then
        print("msg is nil")
        return
    end

    LogInfo("msg ", Msg)
end

and go code

h.L.CallByParam(lua.P{
  Fn:   h.L.GetGlobal("testfunc"),
  NRet: 0,
})

and the log shows: