Is this something you looked at as part of your course?
No we didn't go that indepth, it was a short module, part of a Product Design degree,
we had an example of a campag crank fast fracturing due to a small nick in the arm and an aluminium seatpost doing the same due to corrosion under some insulation tape the rider used as a height marker,
it could be something as simple as a section of the handlebar having a thinner wall causing the failure, or even the handlebar being inappropriately designed for the loads it would be subject to,
the report is also a bit sketchy on detail and it could even be the stem and problem there, a welding issue maybe,
would be nice to get some more details,
Giant Cadex CFM1 1991 single speed