As of patch 1.08.01 the lawbringer can no longer perform the judge, jury, and executioner combo. upon attempting to do so, the first two attacks of the combo perform as usual, but the third attack which should be an unblockable heavy performs as a regular blockable heavy. It appears that the animation for the third attack in the swift justice combo has taken the place of the unblockablle heavy that should be performed at the end of the judge, jury, and executioner. I hope I explained everything clearly enough to understand. I'm unsure if this is an intentional change but I didn't see it in the patch notes so I'm assuming not.
[EDIT] I somehow forgot to mention that for this glitch to take place you must be out of lock on
Okay, so i found that when not hitting an enemy with any of the attacks in the combo the unblockable works. But if you hit an enemy with the first AND second attack in the combo then the 3rd attack fails to register as an unblockable. Also, if you miss the first attack, and then hit with the second, the third attack fails to register as an unblockable.