In Plea Bargaining Down to a Lesser Included Offense, Does a Defendant Waive Absolutely All Possible Punishment Error of Any Kind?

A Texas state prosecutor charges a defendant with specific crimes which have certain punishments associated with them. The most common type of plea bargaining is for the State to try to get the defendant to agree to the most punishment possible and for the defendant to try to get the State to agree to the least punishment possible. When the two parties agree as to such a matter and they can get the judge to approve it, then the defendant is stuck with having pleaded guilty and that State is stuck with a particular minimum punishment, and neither side can appeal.
But, as Texas Ninth Court of Appeals Justice Leanne Johnson writes for a panel including Chief Justice Steve McKeithen and Justice Hollis Horton, there is another type of plea bargaining which can be done along with or instead of the other type, which is plea bargaining about which crime should be charged.  Roberto Ishmael Alvarado was charged with capital murder but reached a plea bargain agreement with the Liberty County District Attorney's Office to only be charged with the lesser-included offense of murder. At that time in the process, the trial judge ruled that Alvarado did not have a right to appeal. This makes sense; the part of the process that determined what crime, if any, Alvarado had committed had been determined by an ordinarily unappealable plea bargain. Texas criminal cases have two parts, though, (1) guilt-innocence and (2) punishment. The State and Alvarado did not agree as to what the punishment should be, and the State allowed Alvarado to go to trial under the lesser-included offense only. The Liberty trial jury popped Alvarado hard-- a 60-year sentence plus a $10,000 fine. The trial judge noted in the sentencing paperwork that the sentence was not entered into pursuant to a plea bargain-- Alvarado had gone to trial so that he, Alvarado, had a right to appeal his punishment. The Nines said here that the trial judge was wrong as to the punishment. Alvarado's plea bargain as to the charge had the effect, they said of limiting his punishment so that the punishment determination had also been reached pursuant to a plea bargain, so that Alvarado, in fact, had no right to appeal.
When a defendant pleads guilty to an offense as part of a plea bargain, that defendant cannot appeal that the defendant is not guilty of that offense, and bears the risk of being mistaken as to culpability for that particular offense. When a defendant agrees to accept a particular punishment, a defendant bears the risk that the prosecutor or the trial judge might make a reversible error in the punishment phase of his or her trial. The prosecutor or the trial judge might have made such a mistake, but the defendant gives up the right to be tried and to find out if reversible error manifests itself.
Even if the defendant agrees to plead guilty to a lesser offense, the State can still prevent the defendant from waiving jury trial as to that lesser offense. Plea bargains are governed in part by the law of contracts. The course of dealing of the parties indicates that the State and the trial judge accepted that the defendant, in trading his right to contest guilt-innocence as to a lesser offense for not having to defend the greater charge, had not agreed to accept maximum punishment as to that lesser offense. There does not appear to be any legal nor policy reason for the court of appeals not to get to the merits of the unbargained-for part of the case. If the Court of Appeals does not think better of this decision on reconsideration, it should be taken up to the Court of Criminal Appeals to see if prosecutors and trial courts don't have the power to make deals like this.