Harris was killed in a motorcycle crash on August 15 on the Vancouver set of the movie, starring actor Ryan Reynolds in the lead.
Deadline obtained an investigation report by WorkSafeBC, British Columbia's version of the US government's Occupational Safety and Health Administration.
It stated that a temporary worksite had been set up to shoot the scene and the Vancouver Police Department had made sure the general public and traffic were away from the site to avoid any accidents.
"The worker (Harris) had been rehearsing a stunt scene that involved driving a motorcycle, Dictate 939 Hyperstrada, out of the open doors of a building, across a concrete pad and down a ramp that had been built over three stairs and coming to a stop on the stair landing.
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Harris had completed five takes of the scene and it was on the sixth take that the bike hit the curb.
"In the maneuover, which was never more than 15 kilometres per hour - (a little less than) 10 miles an hour - she rode on a flat surface through two open doors and then turned left and went out of camera range.
The shooting of the film was postponed for two days after Harris' demise.
The movie is scheduled to release next year.