GameObject[] goPais;

goPais = GameObject.FindGameObjectsWithTag("Pai");
if(goPais.Length != 0)
{
Debug.Log("★-1- おかしな現象が起きてるぞ goPais.Length=" + goPais.Length);
}

ScriptPai pai = MakePai(0, 0, 0);

goPais = GameObject.FindGameObjectsWithTag("Pai");
if (goPais.Length != 1)
{
Debug.Log("★-2- おかしな現象が起きてるぞ goPais.Length=" + goPais.Length);
}

//pai.tag = "Player"; // このあとDestroyしてるのにGameObject.FindGameObjectsWithTag("Pai");で見つけてしまう

Destroy(pai.gameObject);

goPais = GameObject.FindGameObjectsWithTag("Pai");
if (goPais.Length != 0)
{
Debug.Log("★-3- おかしな現象が起きてるぞ goPais.Length="+ goPais.Length);
}