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UPDATE April 2 2017: Hasselblad has confirmed the issue and is working on it. It involves the way autofocus interacts with the spatial frequency of the subject, which fits perfectly with my field observations of the shooting situations that saw an issue.
The X1D had the latest firmware. The 90mm f/3.2 had firmware 0.5.1 for some shots, but updating to version 0.5.3 shows the same behavior and is confirmed by a reader. I emphasize that bugs are bugs, and that most of the time the 90/3.2 focuses properly and that I have seen many a camera have focus errors. However, I deem "most" a non-starter from what I experienced.
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