Judge should be disbarred.
Isn’t it some kind of Double Jeopardy to do this anyway?
That is why the State rules don't allow it. There may be a window of time when the Judge can look around the court room at the shocked faces and say "Did I say 30 days? I meant 30 years!" and make it stick, but he can't pronounce and sign the judgment, decide he is taking too much heat, and then bring the defendant back and add to his time.