(a) A court must grant a new trial when it has found a meritorious ground for new trial, but a court must grant only a new trial on punishment when it has found a ground that affected only the assessment of punishment.
(b) Granting a new trial restores the case to its position before the former trial, including, at any party's option, arraignment or pretrial proceedings initiated by that party.
(c) Granting a new trial on punishment restores the case to its position after the defendant was found guilty. Unless the defendant, State, and trial court all agree to a change, punishment in a new trial shall be assessed in accordance with the defendant's original election under article 37.07, § 2(b) of the Code of Criminal Procedure.
(d) A finding or verdict of guilt in the former trial must not be regarded as a presumption of guilt, nor may it be alluded to in the presence of the jury that hears the case on retrial of guilt. A finding of fact or an assessment of punishment in the former trial may not be alluded to in the presence of the jury that hears the case on retrial of punishment.