A part of the job that is completely different to what you've been doing, only you were promoted to it because of what you've been doing?
Isn't this like a recipe for the Peter Principle?
"The Peter principle is a concept in management developed by Laurence J. Peter which observes that people in a hierarchy tend to rise to "a level of respective incompetence": employees are promoted based on their success in previous jobs until they reach a level at which they are no longer competent, as skills in one job do not necessarily translate to another"