Does divorce occur by means of self-talk according to the Shafi'is, knowing that the questioner is influenced by some opinions of the Malikis?

Divorce does not occur merely by thinking about it or intending it and then retracting that intention, even according to the Maliki school. The relied-upon opinion is that it is not binding through internal speech. There is no effect from obsessive thoughts (waswasa) or what comes to mind, because a mere intention or aim does not make a divorce binding by agreement. Therefore, disregard these obsessive thoughts and pay them no attention.