macOS shows Hairline font with usWeightValue of 100 as "HairLine" camelcase?

There’s nothing in the metadata or .glyphs file I’ve set as such but it is showing up as that in macOS Apps like Font Book, TextEdit and Keynote. Any ideas?

On macOS Tahoe 26.2 (25C56)

macOS has a few style names that it applies based on heuristics, that could be cause.