This is not an uncommon problem as of late. I mean it's not running ramped, but I've seen this several times over the last decade.
The issue lies in the hands of the company doing the hardening of the shaft. Their QA seemed to fail the final inspection in this case.
I've seen crank pins Rockwell tested correctly on one side and nothing on the other because the pin was exposed on one side during the hardening process. I thought I had a pix of a crank pin that was run this way, but can't find it at the moment.
Anyway, it just goes to show that even if it's a top notch company making parts............shit happens.......