Curse augments and other stacking augments NEED to give you stacks during Bye rounds.
Champions with stacking abilities like Smolder, Nasus, etc get a certain amount of free stacks per round, including Bye rounds; but curse augments and I think a bunch of others like Demat don't give any stacks.
This is incredibly frustrating when you finally feel like you have good build going but you get bad lucked into a bye round and lose out on a ton of scaling potential. I still cry a little inside every time I finally get a curse build going after a bad start and then get forced into a Bye round at 25 hp, and then the execution threshold increases from 20 to 25 hp so I die anyway because I have low stacks on my curses.
Also, I feel like in 3v3 there are way more bye rounds than usual, I just played a game where I legitimately got 4 bye rounds, though I realize that's a complete outlier, it still felt terrible to be down potentially 400+ curse stacks late game.