While it's possible that this was John tweaking the game balance, there's also another possible culprit in the patch notes:
Either way, 2.2 should be far easier to complete now, down from being the hardest level in the game to the second easiest.
Fixed an issue where AOE attacks could be blocked if something obscured vision
Either way, 2.2 should be far easier to complete now, down from being the hardest level in the game to the second easiest.