Thanks for getting in touch! I'm terribly sorry for the delay in getting back to you. Am I correct in assuming that you've bound either the Client or BuildId prompted variable to the package ID in your package step? If I'm correct in my assumption, this is actually the expected behavior you're experiencing. Providing a value to a prompted variable happens at deployment time instead of at release creation time, which is when the package details need to be supplied.
If I'm incorrect at all, please let me know! Could you provide additional details, like any error messages you're seeing to help us understand what could be going on better?