When I was learing to fly (or should I say being taught how to handle an aircraft?) back in the dark ages (1978-79) I soon learned that flight manuals were being written by the corporate legal areas of the manufacturers.
The flight manual for the PA28-161 said on the chapter on stalls that (something along the lines of) "During practice stalls, there is a possibilty that the engine will stop. Recovery: Break the stall; nose down, wings level and try to re-start the engine by use of the ignition system. If this fails nose down; to 130 knots windmilling the propellor. If this fails - SEE CHAPTER 8 - EMERGENCY LANDINGS.
BTW I never had an engine stop during practice stalls in either single or twin engine aircraft EVER.