FWIW, this doesn't only happen with promotions to "management". Senior IC roles often come with new responsibilities, like influencing influencing technical direction, often without any "hard" power to do so. I've seen plenty of people struggle with the change in scope of their job. Some rise to it.
Or you could do what I did. Quit your job, found a startup, and be definitely incompetent at most of what you need to do.
Or you could do what I did. Quit your job, found a startup, and be definitely incompetent at most of what you need to do.