Except when there are no material facts in dispute, when a person does not consent to the shortened procedure, the Commission will assign the proceeding for hearing as provided by subpart E of part 385 of this chapter. Notwithstanding a person's not giving consent to the shortened procedure, and instead seeking assignment for hearing as provided for by subpart E of part 385 of this chapter, the Commission will not assign the proceeding for a hearing when no material facts are in dispute. The Commission may also, in its discretion, at any stage in the proceeding, set the proceeding for hearing.