It’s pretty common to have all kinds of undocumented “fun” in cheaper, half-assed production & manufacturing.

Don’t know anything about RAK, but this smells like cheap Chinese outsourcing. Just my experience - could just be an oversight.

You get to a point where you half ignore the data sheets and inspect yourself. Can trust anything from the cheaper producers… they’ll document one thing, deliver another to you, then claim “oh, it’s a slightly different production version. No documentation yet.”