That's interesting. I hadn't checked mine.
I'm not entirely sure which cable I've just looked at is -- might well be the Gemini one, rather than the Cosmo -- but it looks to be a power cable only, rather than a proper, full USB3 thing. There don't appear to be the second set of conductors in the A end, and the C end is missing quite a lot of (what I seem to remember are) data pins.
Try again with a proper USB-C data cable?