USB-C cable colour codes

This ha caught me out a couple of times recently. I wanted a USB-C extension cable to keep my desk clear of clutter. Every one I've tried can't handle data to attached USB 2/3 hubs although it does seem to power them.

There's another issue too, where displays attached work fine until unplugged. For some reason the computer continues to think it's attached even when tie is severed completely. Only a hard restart solves the issue. Not limited to any particular cable, as I've tried a few and had the same issue.

For the USB 2/3 issue, apparently part of it is down to orientation of the cable which defeats one of the selling points of USB-C. The other I haven't found a solution to so I'm stuck with dongles hanging out of my MacBook Pro for now.