When trying to beat General Mayhem's Headquarters at the normal level, the second wave of gnomes never appears. They come in groups of 2 just fine, but when the difficulty is supposed to rise, and they are supposed to come in bigger groups, they don't. the General is still unhittable as well. I have tried all 3 current servers.
I am having this issue in multiple areas. If you play on hard with a crew the issue seems to go away, but for me playing normal or easy with or without crew results in the boss never doing anything and the waves stopping short.