Engineer here, I’ve never heard of that requirement. Ask the agent to cite where that is coming from…it might be local requirement.

Definition of a Bedroom BEDROOM - A room providing privacy intended primarily for sleeping, and consisting of all of the following: a. floor space of no less than 70 square feet; b. for new construction, a ceiling height of no less than seven (7) feet three (3) inches; c. for existing houses, a ceiling height of no less than seven (7) feet; d. the required ceiling height, as defined in (b.) and (c.) above, cover at least fifty percent (50%) of the required floor area, and that, for sloped ceilings, no part of the required floor area shall have less than five (5) feet in ceiling height; e. an electrical service and ventilation; and f. a window which has a net clear opening of 3.3 square feet (0.307 m 2) and the minimum net clear opening shall be 20”x 24” in either direction. Bedrooms shall not open directly into garages. Bonus rooms shall be considered bed- rooms. Sill height for bedroom windows shall not exceed 44”.