Does a decision by the Supreme Court, after a plea is entered but before sentencing, present sufficient cause to consider if the plea was entered knowingly and voluntarily, in the context of Due Process as set out in Boykin v. Alabama?

QUESTION PRESENTED Does a decision by the Supreme Court, after a plea is entered but before sentencing, present sufficient cause to consider if the plea was entered knowingly and voluntarily, in the context of Due Process as set out in Boykin v. Alabama? 2