What is the test for a jury to overturn a finding that the trial court's instruction was erroneous?

The majority concludes that since the trial court's instruction was erroneous and the jury disobeyed that instruction, the verdict is valid. The soundness of this proposition is not clear to me. When the jury is given proper instructions and returns a general verdict, we assume that the jury has deliberated in accordance with the instructions it has received; and if there is any rational basis on which it could have arrived at its verdict within the legal framework it was given, we assume that is the basis on which it has operated. When, however, the jury returns a special verdict that clearly reveals that it has disobeyed the court's instructions, we have no way of knowing (regardless of whether those instructions were correct or erroneous) within what legal framework the jury made its decision. It is inappropriate to assume that a "lay jury will know enough to disregard the judge's bad law if in fact he misguides them. To do so would transfer to the jury the judge's function in giving the law and transfer to the appellate court the jury's function of measuring the evidence by appropriate legal yardsticks." Bollenbach v. United States, 326 U.S. 607, 613-14, 66 S.Ct. 402, 405-06, 90 L.Ed. 350 (1946) (emphasis added).