[brianpgordon]

When I was trying to clone the drive from my old MBP to my new one, Apple's restore tool refused to recognize the USB-C charging cable (that comes with the MBP power supply) as compatible with Thunderbolt. But running a classic Thunderbolt cable with USB-C dongles on both ends worked fine.

It turns out that the Apple USB-C high-speed charging cables just don't support the required Thunderbolt standard, and the software can somehow tell that the cable is incompatible despite it fitting in the slot.

[kec]

Charging cables are usb2.0 and power delivery only, take a peek inside the end and you can see all the missing pins.