I made a topic about this a while ago expecting it to be fixed soonish. Welp, here I am months later and the coop campaign is still unplayable. There’s a 0.5-2 second delay between when you shoot something and when the bullet counts as registered. All my friends have this issue, doesn’t matter who plays or on what internet. It’s a chronic issue baked into the campaign. I don’t know how you mess up coop so badly, especially when this problem doesn’t exist in previous games.
Will they ever fix it? Probably not but it should be noted that it’s an issue with the game.