The Champion's (a Fighter Archetype) "Improved Critical" feature says that he can score a critical hit on a roll of 19 or 20. However, the vicious Weapon enchantment specifically says that you need to roll a 20 on the attack roll to get it's bonus dice. Am I correct in assuming that this means that a Champion wielding a vicious Weapon would get a critical on a 19, but wouldn't get the bonus 2d6 from the Vicious Weapon?
As a bonus question: Do we know if this is intentional, or if it was just a spelling mistake to say specifically 20, instead of just saying "critical" in the Vicious Weapon's description?