[docjay]

It’s not properly shielded. If you have a multimeter you can do a quick low-hanging fruit pass by checking continuity between the metal shields on both ends. No continuity means no shielding, but the clever assholes will run a thin wire between the shields so it passes that test, even though it’s not actually shielded. That means it won’t tell you if it is shielded, only if it definitely isn’t.

I found a similar issue with nearly all of my cheap USB cables, which I started looking into when I realized only some of them would work right with my camera or Arduino. Out of ~30 cables perhaps 14-16 of them had no shielding at all. I cut open five “shielded” ones and two of them had a thin wire connecting the shields, just to fool people casually testing them. It’s a real crap industry.