The key openTypeOS2Selection in fontinfo.plist should not include bit 0, 5 or 6.
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You are correct. According to the UFO specification, bits 0 (italic), 5 (bold), and 6 (regular) must not be included in openTypeOS2Selection. These flags should instead be derived from styleMapStyleName.
I will adjust FontCreator’s UFO export accordingly. Thank you for reporting this!