Sounds like a serious defect to me. This is a user-to-user forum, but you can post bug reports and feature requests at the official Adobe feedback forum: Recently active topics in Photoshop Family about Photoshop Lightroom. Adobe reads that forum diligently and occasionally responds.
I just tested it and the facial recognition data did import as expected via "Import from another catalog". Maybe review exactly what steps you took. Was the data in the catalogue you imported?